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In mathematics, the '''G-function''' was introduced by {{harvs | txt | authorlink= Cornelis Simon Meijer | first= Cornelis Simon | last= Meijer | year= 1936}} as a very general [[function (mathematics)|function]] intended to include most of the known [[special function]]s as particular cases. This was not the only attempt of its kind: the [[generalized hypergeometric function]] and the [[MacRobert E-function]] had the same aim, but Meijer's G-function was able to include those as particular cases as well. The first definition was made by Meijer using a [[series (mathematics)|series]]; nowadays the accepted and more general definition is via a [[line integral|path integral]] in the [[complex plane]], introduced in its full generality by [[Arthur Erdélyi]] in 1953. | |||
With the modern definition, the majority of the established special functions can be represented in terms of the Meijer G-function. A notable property is the [[closure (mathematics)|closure]] of the set of all G-functions not only under differentiation but also under indefinite integration. In combination with a [[functional equation]] that allows to liberate from a G-function ''G''(''z'') any factor ''z''<sup>''ρ''</sup> that is a constant power of its argument ''z'', the closure implies that whenever a function is expressible as a G-function of a constant multiple of some constant power of the function argument, ''f''(''x'') = ''G''(''cx''<sup>''γ''</sup>), the [[derivative]] and the [[antiderivative]] of this function are expressible so too. | |||
The wide coverage of special functions also lends power to uses of Meijer's G-function other than the representation and manipulation of derivatives and antiderivatives. Thus, the [[definite integral]] over the positive real axis of any function ''g''(''x'') that can be written as a product ''G''<sub>1</sub>(''cx''<sup>''γ''</sup>)·''G''<sub>2</sub>(''dx''<sup>''δ''</sup>) of two G-functions with [[rational number|rational]] ''γ''/''δ'' equals just another G-function, and generalizations of [[integral transform]]s like the [[Hankel transform]] and the [[Laplace transform]] and their inverses result when suitable G-function pairs are employed as transform kernels. | |||
A still more general function, which introduces additional parameters into Meijer's G-function, is [[Fox H-function|Fox's H-function]]. | |||
==Definition of the Meijer G-function== | |||
A general definition of the Meijer G-function is given by the following [[line integral]] in the [[complex plane]] {{harv|Bateman|Erdélyi|1953|loc=§ 5.3-1}}: | |||
:<math> | |||
G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} a_1, \dots, a_p \\ b_1, \dots, b_q \end{matrix} \; \right| \, z \right) = \frac{1}{2 \pi i} \int_L \frac{\prod_{j=1}^m \Gamma(b_j - s) \prod_{j=1}^n \Gamma(1 - a_j +s)} {\prod_{j=m+1}^q \Gamma(1 - b_j + s) \prod_{j=n+1}^p \Gamma(a_j - s)} \,z^s \,ds, | |||
</math> | |||
where Γ denotes the [[gamma function]]. This integral is of the so-called [[Mellin–Barnes integral|Mellin–Barnes type]], and may be viewed as an inverse [[Mellin transform]]. The definition holds under the following assumptions: | |||
* 0 ≤ ''m'' ≤ ''q'' and 0 ≤ ''n'' ≤ ''p'', where ''m'', ''n'', ''p'' and ''q'' are integer numbers | |||
* ''a''<sub>''k''</sub> − ''b''<sub>''j''</sub> ≠ 1, 2, 3, ... for ''k'' = 1, 2, ..., ''n'' and ''j'' = 1, 2, ..., ''m'', which implies that no [[pole (complex analysis)|pole]] of any Γ(''b''<sub>''j''</sub> − ''s''), ''j'' = 1, 2, ..., ''m'', coincides with any pole of any Γ(1 − ''a''<sub>''k''</sub> + ''s''), ''k'' = 1, 2, ..., ''n'' | |||
* ''z'' ≠ 0 | |||
Note that for historical reasons the ''first'' lower and ''second'' upper index refer to the ''top'' parameter row, while the ''second'' lower and ''first'' upper index refer to the ''bottom'' parameter row. One often encounters the following more synthetic notation using [[vector (mathematics and physics)|vectors]]: | |||
:<math> | |||
G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} a_1, \dots, a_p \\ b_1, \dots, b_q \end{matrix} \; \right| \, z \right) = | |||
G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right) . | |||
</math> | |||
Implementations of the G-function in [[computer algebra system]]s typically employ separate vector arguments for the four (possibly empty) parameter groups ''a''<sub>1</sub> ... ''a''<sub>''n''</sub>, ''a''<sub>''n''+1</sub> ... ''a''<sub>''p''</sub>, ''b''<sub>1</sub> ... ''b''<sub>''m''</sub>, and ''b''<sub>''m''+1</sub> ... ''b''<sub>''q''</sub>, and thus can omit the orders ''p'', ''q'', ''n'', and ''m'' as redundant. | |||
The ''L'' in the integral represents the path to be followed while integrating. Three choices are possible for this path: | |||
:'''1.''' ''L'' runs from −''i''∞ to +''i''∞ such that all poles of Γ(''b''<sub>''j''</sub> − ''s''), ''j'' = 1, 2, ..., ''m'', are on the right of the path, while all poles of Γ(1 − ''a''<sub>''k''</sub> + ''s''), ''k'' = 1, 2, ..., ''n'', are on the left. The integral then converges for |arg ''z''| < ''δ'' ''π'', where | |||
::<math> | |||
\delta = m + n - \tfrac{1}{2} (p+q) ; | |||
</math> | |||
:an obvious prerequisite for this is ''δ'' > 0. The integral additionally converges for |arg ''z''| = ''δ'' ''π'' ≥ 0 if (q − p) (''σ'' + <sup>1</sup>⁄<sub>2</sub>) > Re(''ν'') + 1, where ''σ'' represents Re(''s'') as the integration variable ''s'' approaches both +''i''∞ and −''i''∞, and where | |||
::<math> | |||
\nu = \sum_{j = 1}^q b_j - \sum_{j = 1}^p a_j . | |||
</math> | |||
:As a corollary, for |arg ''z''| = ''δ'' ''π'' and ''p'' = ''q'' the integral converges independent of ''σ'' whenever Re(''ν'') < −1. | |||
:'''2.''' ''L'' is a loop beginning and ending at +∞, encircling all poles of Γ(''b''<sub>''j''</sub> − ''s''), ''j'' = 1, 2, ..., ''m'', exactly once in the negative direction, but not encircling any pole of Γ(1 − ''a''<sub>''k''</sub> + ''s''), ''k'' = 1, 2, ..., ''n''. Then the integral converges for all ''z'' if ''q'' > ''p'' ≥ 0; it also converges for ''q'' = ''p'' > 0 as long as |''z''| < 1. In the latter case, the integral additionally converges for |''z''| = 1 if Re(''ν'') < −1, where ''ν'' is defined as for the first path. | |||
:'''3.''' ''L'' is a loop beginning and ending at −∞ and encircling all poles of Γ(1 − ''a''<sub>''k''</sub> + ''s''), ''k'' = 1, 2, ..., ''n'', exactly once in the positive direction, but not encircling any pole of Γ(''b''<sub>''j''</sub> − ''s''), ''j'' = 1, 2, ..., ''m''. Now the integral converges for all ''z'' if ''p'' > ''q'' ≥ 0; it also converges for ''p'' = ''q'' > 0 as long as |''z''| > 1. As noted for the second path too, in the case of ''p'' = ''q'' the integral also converges for |''z''| = 1 when Re(''ν'') < −1. | |||
The conditions for convergence are readily established by applying [[Stirling's approximation|Stirling's asymptotic approximation]] to the gamma functions in the integrand. When the integral converges for more than one of these paths, the results of integration can be shown to agree; if it converges for only one path, then this is the only one to be considered. In fact, numerical path integration in the complex plane constitutes a practicable and sensible approach to the calculation of Meijer G-functions. | |||
As a consequence of this definition, the Meijer G-function is an [[analytic function]] of ''z'' with possible exception of the origin ''z'' = 0 and of the unit circle |''z''| = 1. | |||
===Differential equation=== | |||
The G-function satisfies the following linear [[ordinary differential equation|differential equation]] of order max(''p'',''q''): | |||
:<math> | |||
\left[ (-1)^{p - m - n} \;z \prod_{j = 1}^p \left( z \frac{d}{dz} - a_j + 1 \right) - \prod_{j = 1}^q \left( z \frac{d}{dz} - b_j \right) \right] G(z) = 0. | |||
</math> | |||
For a fundamental set of solutions of this equation in the case of ''p'' ≤ ''q'' one may take: | |||
:<math> | |||
G_{p,q}^{\,1,p} \!\left( \left. \begin{matrix} a_1, \dots, a_p \\ b_h, b_1, \dots, b_{h-1}, b_{h+1}, \dots, b_q \end{matrix} \; \right| \, (-1)^{p-m-n+1} \;z \right), \quad h = 1,2,\dots,q, | |||
</math> | |||
and similarly in the case of ''p'' ≥ ''q'': | |||
:<math> | |||
G_{p,q}^{\,q,1} \!\left( \left. \begin{matrix} a_h, a_1, \dots, a_{h-1}, a_{h+1}, \dots, a_p \\ b_1, \dots, b_q \end{matrix} \; \right| \, (-1)^{q-m-n+1} \;z \right), \quad h = 1,2,\dots,p. | |||
</math> | |||
These particular solutions are analytic except for a possible [[mathematical singularity|singularity]] at ''z'' = 0 (as well as a possible singularity at ''z'' = ∞), and in the case of ''p'' = ''q'' also an inevitable singularity at ''z'' = (−1)<sup>''p''−''m''−''n''</sup>. As will be seen presently, they can be identified with [[generalized hypergeometric function]]s <sub>''p''</sub>''F''<sub>''q''−1</sub> of argument (−1)<sup>''p''−''m''−''n''</sup> ''z'' that are multiplied by a power ''z''<sup>''b''<sub>''h''</sub></sup>, and with generalized hypergeometric functions <sub>''q''</sub>''F''<sub>''p''−1</sub> of argument (−1)<sup>''q''−''m''−''n''</sup> ''z''<sup>−1</sup> that are multiplied by a power ''z''<sup>''a''<sub>''h''</sub>−1</sup>, respectively. | |||
==Relationship between the G-function and the generalized hypergeometric function== | |||
If the integral converges when evaluated along the [[#Definition of the Meijer G-function|second path]] introduced above, and if no confluent [[pole (complex analysis)|poles]] appear among the Γ(''b''<sub>''j''</sub> − ''s''), ''j'' = 1, 2, ..., ''m'', then the Meijer G-function can be expressed as a sum of [[residue (complex analysis)|residue]]s in terms of [[generalized hypergeometric function]]s <sub>''p''</sub>''F''<sub>''q''−1</sub> (Slater's theorem): | |||
:<math> | |||
G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right) = \sum_{h=1}^m \frac{\prod_{j=1}^m \Gamma(b_j - b_h)^* \prod_{j=1}^n \Gamma(1+b_h - a_j) \; z^{b_h}} {\prod_{j=m+1}^q \Gamma(1+b_h - b_j) \prod_{j=n+1}^p \Gamma(a_j - b_h)} \times | |||
</math> | |||
:<math> | |||
\times \; _{p}F_{q-1} \!\left( \left. \begin{matrix} 1+b_h - \mathbf{a_p} \\ (1+b_h - \mathbf{b_q})^* \end{matrix} \; \right| \, (-1)^{p-m-n} \; z \right) . | |||
</math> | |||
For the integral to converge along the second path one must have either ''p'' < ''q'', or ''p'' = ''q'' and |''z''| < 1, and for the poles to be distinct no pair among the ''b''<sub>''j''</sub>, ''j'' = 1, 2, ..., ''m'', may differ by an integer or zero. The asterisks in the relation remind us to ignore the contribution with index ''j'' = ''h'' as follows: In the product this amounts to replacing Γ(0) with 1, and in the argument of the hypergeometric function, if we recall the meaning of the vector notation, | |||
:<math> | |||
1 + b_h - \mathbf{b_q} = (1 + b_h - b_1), \,\dots, \,(1 + b_h - b_j), \,\dots, \,(1 + b_h - b_q), | |||
</math> | |||
this amounts to shortening the vector length from ''q'' to ''q''−1. | |||
Note that when ''m'' = 0, the second path does not contain any pole, and so the integral must vanish identically, | |||
:<math> | |||
G_{p,q}^{\,0,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right) = 0, | |||
</math> | |||
if either ''p'' < ''q'', or ''p'' = ''q'' and |''z''| < 1. | |||
Similarly, if the integral converges when evaluated along the [[#Definition of the Meijer G-function|third path]] above, and if no confluent poles appear among the Γ(1 − ''a''<sub>''k''</sub> + ''s''), ''k'' = 1, 2, ..., ''n'', then the G-function can be expressed as: | |||
:<math> | |||
G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right) = \sum_{h=1}^n \frac{\prod_{j=1}^n \Gamma(a_h - a_j)^* \prod_{j=1}^m \Gamma(1-a_h + b_j) \; z^{a_h-1}} {\prod_{j=n+1}^p \Gamma(1-a_h + a_j) \prod_{j=m+1}^q \Gamma(a_h - b_j)} \times | |||
</math> | |||
:<math> | |||
\times \; _{q}F_{p-1} \!\left( \left. \begin{matrix} 1-a_h + \mathbf{b_q} \\ (1-a_h + \mathbf{a_p})^* \end{matrix} \; \right| \, (-1)^{q-m-n} z^{-1} \right) . | |||
</math> | |||
For this, either ''p'' > ''q'', or ''p'' = ''q'' and |''z''| > 1 are required, and no pair among the ''a''<sub>''k''</sub>, ''k'' = 1, 2, ..., ''n'', may differ by an integer or zero. For ''n'' = 0 one consequently has: | |||
:<math> | |||
G_{p,q}^{\,m,0} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right) = 0, | |||
</math> | |||
if either ''p'' > ''q'', or ''p'' = ''q'' and |''z''| > 1. | |||
On the other hand, any generalized hypergeometric function can readily be expressed in terms of the Meijer G-function: | |||
:<math> | |||
\; _{p}F_{q} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right) | |||
= \frac {\Gamma(\mathbf{b_q})} {\Gamma(\mathbf{a_p})} \; G_{p,\,q+1}^{\,1,\,p} \!\left( \left. \begin{matrix} 1-\mathbf{a_p} \\ 0,1 - \mathbf{b_q} \end{matrix} \; \right| \, -z \right) | |||
= \frac {\Gamma(\mathbf{b_q})} {\Gamma(\mathbf{a_p})} \; G_{q+1,\,p}^{\,p,\,1} \!\left( \left. \begin{matrix} 1,\mathbf{b_q} \\ \mathbf{a_p} \end{matrix} \; \right| \, -z^{-1} \right), | |||
</math> | |||
where we have made use of the vector notation: | |||
:<math> | |||
\Gamma(\mathbf{a_p}) = \prod_{j=1}^p \Gamma(a_j). | |||
</math> | |||
This holds unless a nonpositive integer value of at least one of its parameters '''a'''<sub>'''p'''</sub> reduces the hypergeometric function to a finite polynomial, in which case the gamma prefactor of either G-function vanishes and the parameter sets of the G-functions violate the requirement ''a''<sub>''k''</sub> − ''b''<sub>''j''</sub> ≠ 1, 2, 3, ... for ''k'' = 1, 2, ..., ''n'' and ''j'' = 1, 2, ..., ''m'' from the [[#Definition of the Meijer G-function|definition]] above. Apart from this restriction, the relationship is valid whenever the generalized hypergeometric series <sub>''p''</sub>''F''<sub>''q''</sub>(''z'') converges, i. e. for any finite ''z'' when ''p'' ≤ ''q'', and for |''z''| < 1 when ''p'' = ''q'' + 1. In the latter case, the relation with the G-function automatically provides the analytic continuation of <sub>''p''</sub>''F''<sub>''q''</sub>(''z'') to |''z''| ≥ 1 with a branch cut from 1 to ∞ along the real axis. Finally, the relation furnishes a natural extension of the definition of the hypergeometric function to orders ''p'' > ''q'' + 1. By means of the G-function we can thus solve the generalized hypergeometric differential equation for ''p'' > ''q'' + 1 as well. | |||
===Polynomial cases=== | |||
To express polynomial cases of generalized hypergeometric functions in terms of Meijer G-functions, a linear combination of two G-functions is needed in general: | |||
:<math> | |||
\; _{p+1}F_{q} \!\left( \left. \begin{matrix} -h, \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right) = h! \; \frac{\prod_{j=n+1}^p \Gamma(1 - a_j) \prod_{j=m+1}^q \Gamma(b_j)} {\prod_{j=1}^n \Gamma(a_j) \prod_{j=1}^m \Gamma(1 - b_j)} \times | |||
</math> | |||
:<math> | |||
\times\left[ G_{p+1,\,q+1}^{\,m+1,\,n} \!\left( \left. \begin{matrix} 1-\mathbf{a_p}, h+1 \\ 0, 1-\mathbf{b_q} \end{matrix} \; \right| \, (-1)^{p-m-n} \; z \right) + (-1)^h \; G_{p+1,\,q+1}^{\,m,\,n+1} \!\left( \left. \begin{matrix} h+1, 1-\mathbf{a_p} \\ 1-\mathbf{b_q}, 0 \end{matrix} \; \right| \, (-1)^{p-m-n} \; z \right) \right] , | |||
</math> | |||
where ''h'' = 0, 1, 2, ... equals the degree of the polynomial <sub>''p''+1</sub>''F''<sub>''q''</sub>(''z''). The orders ''m'' and ''n'' can be chosen freely in the ranges 0 ≤ ''m'' ≤ ''q'' and 0 ≤ ''n'' ≤ ''p'', which allows to avoid that specific integer values or integer differences among the parameters '''a'''<sub>'''p'''</sub> and '''b'''<sub>'''q'''</sub> of the polynomial give rise to divergent gamma functions in the prefactor or to a conflict with the [[#Definition of the Meijer G-function|definition of the G-function]]. Note that the first G-function vanishes for ''n'' = 0 if ''p'' > ''q'', while the second G-function vanishes for ''m'' = 0 if ''p'' < ''q''. Again, the formula can be verified by expressing the two G-functions as sums of [[residue (complex analysis)|residues]]; no cases of confluent [[pole (complex analysis)|poles]] permitted by the definition of the G-function need be excluded here. | |||
==Basic properties of the G-function== | |||
As can be seen from the [[#Definition of the Meijer G-function|definition of the G-function]], if equal parameters appear among the '''a'''<sub>'''p'''</sub> and '''b'''<sub>'''q'''</sub> determining the factors in the numerator and the denominator of the integrand, the fraction can be simplified, and the order of the function thereby be reduced. Whether the order ''m'' or ''n'' will decrease depends of the particular position of the parameters in question. Thus, if one of the ''a''<sub>''k''</sub>, ''k'' = 1, 2, ..., ''n'', equals one of the ''b''<sub>''j''</sub>, ''j'' = ''m'' + 1, ..., ''q'', the G-function lowers its orders ''p'', ''q'' and ''n'': | |||
:<math> | |||
G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} a_1, a_2, \dots, a_p \\ b_1, \dots, b_{q-1}, a_1 \end{matrix} \; \right| \, z \right) = | |||
G_{p-1,\,q-1}^{\,m,\,n-1} \!\left( \left. \begin{matrix} a_2, \dots, a_p \\ b_1, \dots, b_{q-1} \end{matrix} \; \right| \, z \right), \quad n,p,q \geq 1. | |||
</math> | |||
For the same reason, if one of the ''a''<sub>''k''</sub>, ''k'' = ''n'' + 1, ..., ''p'', equals one of the ''b''<sub>''j''</sub>, ''j'' = 1, 2, ..., ''m'', then the G-function lowers its orders ''p'', ''q'' and ''m'': | |||
:<math> | |||
G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} a_1, \dots, a_{p-1}, b_1 \\ b_1, b_2, \dots, b_q \end{matrix} \; \right| \, z \right) = | |||
G_{p-1,\,q-1}^{\,m-1,\,n} \!\left( \left. \begin{matrix} a_1, \dots, a_{p-1} \\ b_2, \dots, b_q \end{matrix} \; \right| \, z \right), \quad m,p,q \geq 1. | |||
</math> | |||
Starting from the definition, it is also possible to derive the following properties: | |||
:<math> | |||
z^{\rho} \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right) = | |||
G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} + \rho \\ \mathbf{b_q} + \rho \end{matrix} \; \right| \, z \right), | |||
</math> | |||
:<math> | |||
G_{p+2,\,q}^{\,m,\,n+1} \!\left( \left. \begin{matrix} \alpha, \mathbf{a_p}, \alpha' \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right) = | |||
(-1)^{\alpha'-\alpha} \; G_{p+2,\,q}^{\,m,\,n+1} \!\left( \left. \begin{matrix} \alpha', \mathbf{a_p}, \alpha \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right), \quad n \leq p, \; \alpha'-\alpha \in \mathbb{Z}, | |||
</math> | |||
:<math> | |||
G_{p,\,q+2}^{\,m+1,\,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \beta, \mathbf{b_q}, \beta' \end{matrix} \; \right| \, z \right) = | |||
(-1)^{\beta'-\beta} \; G_{p,\,q+2}^{\,m+1,\,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \beta', \mathbf{b_q}, \beta \end{matrix} \; \right| \, z \right), \quad m \leq q, \; \beta'-\beta \in \mathbb{Z}, | |||
</math> | |||
:<math> | |||
G_{p+1,\,q+1}^{\,m,\,n+1} \!\left( \left. \begin{matrix} \alpha, \mathbf{a_p} \\ \mathbf{b_q}, \beta \end{matrix} \; \right| \, z \right) = | |||
(-1)^{\beta-\alpha} \; G_{p+1,\,q+1}^{\,m+1,\,n} \!\left( \left. \begin{matrix} \mathbf{a_p}, \alpha \\ \beta, \mathbf{b_q} \end{matrix} \; \right| \, z \right), \quad m \leq q, \; \beta-\alpha = 0,1,2,\dots, | |||
</math> | |||
:<math> | |||
G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right) = | |||
G_{q,p}^{\,n,m} \!\left( \left. \begin{matrix} 1-\mathbf{b_q} \\ 1-\mathbf{a_p} \end{matrix} \; \right| \, z^{-1} \right), | |||
</math> | |||
:<math> | |||
G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right) = | |||
\frac{h^{1+\nu+(p-q)/2}} {(2 \pi)^{(h-1) \delta}} \; G_{h p, \, h q}^{\, h m, \, h n} \!\left( \left. \begin{matrix} a_1/h, \dots, (a_1+h-1)/h, \dots, a_p/h, \dots, (a_p+h-1)/h \\ b_1/h, \dots, (b_1+h-1)/h, \dots, b_q/h, \dots, (b_q+h-1)/h \end{matrix} \; \right| \, \frac{z^h} {h^{h(q-p)}} \right), \quad h \in \mathbb{N}. | |||
</math> | |||
The abbreviations ''ν'' and ''δ'' were introduced in the [[#Definition of the Meijer G-function|definition of the G-function]] above. | |||
===Derivatives and antiderivatives=== | |||
Concerning [[derivative]]s of the G-function, one finds these relationships: | |||
:<math> | |||
\frac{d}{dz} \left[ z^{1-a_1} \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right) \right] = | |||
z^{-a_1} \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} a_1 - 1, a_2, \dots, a_p \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right), \quad n \geq 1, | |||
</math> | |||
:<math> | |||
\frac{d}{dz} \left[ z^{1-a_p} \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right) \right] = | |||
- z^{-a_p} \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} a_1, \dots, a_{p-1}, a_p - 1 \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right), \quad n < p. | |||
</math> | |||
:<math> | |||
\frac{d}{dz} \left[ z^{-b_1} \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right) \right] = | |||
- z^{-1-b_1} \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ b_1 + 1, b_2, \dots, b_q \end{matrix} \; \right| \, z \right), \quad m \geq 1, | |||
</math> | |||
:<math> | |||
\frac{d}{dz} \left[ z^{-b_q} \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right) \right] = | |||
z^{-1-b_q} \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ b_1, \dots, b_{q-1}, b_q + 1 \end{matrix} \; \right| \, z \right), \quad m < q, | |||
</math> | |||
From these four, equivalent relations can be deduced by simply evaluating the derivative on the left-hand side and manipulating a bit. One obtains for example: | |||
:<math> | |||
z \frac{d}{dz} \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right) = | |||
G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} a_1 -1, a_2, \dots, a_p \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right) + | |||
(a_1 - 1) \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right), \quad n \geq 1. | |||
</math> | |||
Moreover, for derivatives of arbitrary order ''h'', one has | |||
:<math> | |||
z^h \frac{d^h}{dz^h} \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right) = | |||
G_{p+1,\,q+1}^{\,m,\,n+1} \!\left( \left. \begin{matrix} 0, \mathbf{a_p} \\ \mathbf{b_q}, h \end{matrix} \; \right| \, z \right) = | |||
(-1)^h \; G_{p+1,\,q+1}^{\,m+1,\,n} \!\left( \left. \begin{matrix} \mathbf{a_p}, 0 \\ h, \mathbf{b_q} \end{matrix} \; \right| \, z \right), | |||
</math> | |||
:<math> | |||
z^h \frac{d^h}{dz^h} \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, z^{-1} \right) = | |||
G_{p+1,\,q+1}^{\,m+1,\,n} \!\left( \left. \begin{matrix} \mathbf{a_p}, 1-h \\ 1, \mathbf{b_q} \end{matrix} \; \right| \, z^{-1} \right) = | |||
(-1)^h \; G_{p+1,\,q+1}^{\,m,\,n+1} \!\left( \left. \begin{matrix} 1-h, \mathbf{a_p} \\ \mathbf{b_q}, 1 \end{matrix} \; \right| \, z^{-1} \right), | |||
</math> | |||
which hold for ''h'' < 0 as well, thus allowing to obtain the [[antiderivative]] of any G-function as easily as the derivative. By choosing one or the other of the two results provided in either formula, one can always prevent the set of parameters in the result from violating the condition ''a''<sub>''k''</sub> − ''b''<sub>''j''</sub> ≠ 1, 2, 3, ... for ''k'' = 1, 2, ..., ''n'' and ''j'' = 1, 2, ..., ''m'' that is imposed by the [[#Definition of the Meijer G-function|definition of the G-function]]. Note that each pair of results becomes unequal in the case of ''h'' < 0. | |||
From these relationships, corresponding properties of the [[hypergeometric function|Gauss hypergeometric function]] and of other special functions can be derived. | |||
===Recurrence relations=== | |||
By equating different expressions for the first-order derivatives, one arrives at the following 3-term recurrence relations among contiguous G-functions: | |||
:<math> | |||
(a_p - a_1) \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right) = | |||
G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} a_1-1, a_2, \dots, a_p \\ b_1, \dots, b_q \end{matrix} \; \right| \, z \right) + | |||
G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} a_1, \dots, a_{p-1}, a_p-1 \\ b_1, \dots, b_q \end{matrix} \; \right| \, z \right), \quad 1 \leq n < p, | |||
</math> | |||
:<math> | |||
(b_1 - b_q) \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right) = | |||
G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} a_1, \dots, a_p \\ b_1+1, b_2, \dots, b_q \end{matrix} \; \right| \, z \right) + | |||
G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} a_1, \dots, a_p \\ b_1, \dots, b_{q-1}, b_q+1 \end{matrix} \; \right| \, z \right), \quad 1 \leq m < q, | |||
</math> | |||
:<math> | |||
(b_1 - a_1 + 1) \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right) = | |||
G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} a_1-1, a_2, \dots, a_p \\ b_1, \dots, b_q \end{matrix} \; \right| \, z \right) + | |||
G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} a_1, \dots, a_p \\ b_1+1, b_2, \dots, b_q \end{matrix} \; \right| \, z \right), \quad n \geq 1, \; m \geq 1, | |||
</math> | |||
:<math> | |||
(a_p - b_q - 1) \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right) = | |||
G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} a_1, \dots, a_{p-1}, a_p-1 \\ b_1, \dots, b_q \end{matrix} \; \right| \, z \right) + | |||
G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} a_1, \dots, a_p \\ b_1, \dots, b_{q-1}, b_q+1 \end{matrix} \; \right| \, z \right), \quad n < p, \; m < q. | |||
</math> | |||
Similar relations for the diagonal parameter pairs ''a''<sub>1</sub>, ''b''<sub>''q''</sub> and ''b''<sub>1</sub>, ''a''<sub>''p''</sub> follow by suitable combination of the above. Again, corresponding properties of hypergeometric and other special functions can be derived from these recurrence relations. | |||
===Multiplication theorems=== | |||
Provided that ''z'' ≠ 0, the following relationships hold: | |||
:<math> | |||
G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, w z \right) = | |||
w^{b_1} \sum_{h=0}^{\infty} \frac{(1 - w)^h}{h!} \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ b_1+h, b_2, \dots, b_q \end{matrix} \; \right| \, z \right), \quad m \geq 1, | |||
</math> | |||
:<math> | |||
G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, w z \right) = | |||
w^{b_q} \sum_{h=0}^{\infty} \frac{(w - 1)^h}{h!} \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ b_1, \dots, b_{q-1}, b_q+h \end{matrix} \; \right| \, z \right), \quad m < q, | |||
</math> | |||
:<math> | |||
G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, \frac{z}{w} \right) = | |||
w^{1-a_1} \sum_{h=0}^{\infty} \frac{(1 - w)^h}{h!} \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} a_1-h, a_2, \dots, a_p \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right), \quad n \geq 1, | |||
</math> | |||
:<math> | |||
G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, \frac{z}{w} \right) = | |||
w^{1-a_p} \sum_{h=0}^{\infty} \frac{(w - 1)^h}{h!} \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} a_1, \dots, a_{p-1}, a_p-h \\ \mathbf{b_q} \end{matrix} \; \right| \, z \right), \quad n < p. | |||
</math> | |||
These follow by [[Taylor series|Taylor expansion]] about ''w'' = 1, with the help of the [[#Basic properties of the G-function|basic properties]] discussed above. The [[radius of convergence|radii of convergence]] will be dependent on the value of ''z'' and on the G-function that is expanded. The expansions can be regarded as generalizations of similar theorems for [[Bessel function|Bessel]], [[hypergeometric function|hypergeometric]] and [[confluent hypergeometric function|confluent hypergeometric]] functions. | |||
==Definite integrals involving the G-function== | |||
Among [[integral|definite integrals]] involving an arbitrary G-function one has: | |||
:<math> | |||
\int_0^{\infty} x^{s - 1} \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, \eta x \right) dx = | |||
\frac{\eta^{-s} \prod_{j = 1}^{m} \Gamma (b_j + s) \prod_{j = 1}^{n} \Gamma (1 - a_j - s)} {\prod_{j = m + 1}^{q} \Gamma (1 - b_j - s) \prod_{j = n + 1}^{p} \Gamma (a_j + s)}. | |||
</math> | |||
Note that the restrictions under which this integral exists have been omitted here. It is, of course, no surprise that the [[Mellin transform]] of a G-function should lead back to the integrand appearing in the [[#Definition of the Meijer G-function|definition]] above. | |||
[[Leonhard Euler|Euler]]-type integrals for the G-function are given by: | |||
:<math> | |||
\int_0^1 x^{-\alpha} \; (1-x)^{\alpha - \beta - 1} \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, z x \right) dx = | |||
\Gamma (\alpha - \beta) \; G_{p+1 ,\, q+1}^{\,m ,\, n+1} \!\left( \left. \begin{matrix} \alpha, \mathbf{a_p} \\ \mathbf{b_q}, \beta \end{matrix} \; \right| \, z \right), | |||
</math> | |||
:<math> | |||
\int_1^\infty x^{-\alpha} \; (x-1)^{\alpha - \beta - 1} \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, z x \right) dx = | |||
\Gamma (\alpha - \beta) \; G_{p+1 ,\, q+1}^{\,m+1 ,\, n} \!\left( \left. \begin{matrix} \mathbf{a_p}, \alpha \\ \beta, \mathbf{b_q} \end{matrix} \; \right| \, z \right). | |||
</math> | |||
Here too, the restrictions under which the integrals exist have been omitted. Note that, in view of their effect on the G-function, these integrals can be used to define the operation of [[fractional calculus|fractional integration]] for a fairly large class of functions ([[Erdélyi–Kober operator]]s). | |||
A result of fundamental importance is that the product of two arbitrary G-functions integrated over the positive real axis can be represented by just another G-function (convolution theorem): | |||
:<math> | |||
\int_0^{\infty} G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, \eta x \right) | |||
G_{\sigma, \tau}^{\,\mu, \nu} \!\left( \left. \begin{matrix} \mathbf{c_{\sigma}} \\ \mathbf{d_\tau} \end{matrix} \; \right| \, \omega x \right) dx = | |||
</math> | |||
:<math> | |||
= \frac{1}{\eta} \; G_{q + \sigma ,\, p + \tau}^{\,n + \mu ,\, m + \nu} \!\left( \left. \begin{matrix} - b_1, \dots, - b_m, \mathbf{c_{\sigma}}, - b_{m+1}, \dots, - b_q \\ - a_1, \dots, -a_n, \mathbf{d_\tau} , - a_{n+1}, \dots, - a_p \end{matrix} \; \right| \, \frac{\omega}{\eta} \right) = | |||
</math> | |||
:<math> = \frac{1}{\omega} \; G_{p + \tau ,\, q + \sigma}^{\,m + \nu ,\, n + \mu} \!\left( \left. \begin{matrix} a_1, \dots, a_n, -\mathbf{d_\tau} , a_{n+1}, \dots, a_p \\ b_1, \dots, b_m, -\mathbf{c_{\sigma}}, b_{m+1}, \dots, b_q \end{matrix} \; \right| \, \frac{\eta}{\omega} \right) . | |||
</math> | |||
Again, the restrictions under which the integral exists have been omitted here. Note how the Mellin transform of the result merely assembles the gamma factors from the Mellin transforms of the two functions in the integrand. Many of the amazing definite integrals listed in tables or produced by [[computer algebra system]]s are nothing but special cases of this formula. | |||
The convolution formula can be derived by substituting the defining Mellin–Barnes integral for one of the G-functions, reversing the order of integration, and evaluating the inner Mellin-transform integral. The preceding Euler-type integrals follow analogously. | |||
===Laplace transform=== | |||
Using the above [[#Definite integrals involving the G-function|convolution integral]] and [[#Basic properties of the G-function|basic properties]] one can show that: | |||
:<math> | |||
\int_0^{\infty} e^{- \omega x} \; x^{- \alpha} \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, \eta x \right) dx = | |||
\omega^{\alpha - 1} \; G_{p + 1,\,q}^{\,m,\,n+1} \!\left( \left. \begin{matrix} \alpha, \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, \frac{\eta}{\omega} \right) , | |||
</math> | |||
where Re(''ω'') > 0. This is the [[Laplace transform]] of a function ''G''(''ηx'') multiplied by a power ''x''<sup>−''α''</sup>; if we put ''α'' = 0 we get the Laplace transform of the G-function. As usual, the inverse transform is then given by: | |||
:<math> | |||
x^{- \alpha} \; G_{p,\,q+1}^{\,m,\,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q}, \alpha \end{matrix} \; \right| \, \eta x \right) = | |||
\frac{1}{2 \pi i} \int_{c - i \infty}^{c + i \infty} e^{\omega x} \; \omega^{\alpha - 1} \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, \frac{\eta}{\omega} \right) d\omega, | |||
</math> | |||
where ''c'' is a real positive constant that places the integration path to the right of any [[pole (complex analysis)|pole]] in the integrand. | |||
Another formula for the Laplace transform of a G-function is: | |||
:<math> | |||
\int_{0}^{\infty} e^{- \omega x} \; G_{p,q}^{\,m,n} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, \eta x^2 \right) dx = | |||
\frac{1}{\sqrt{\pi} \omega} \; G_{p+2,\,q}^{\,m,\,n+2} \!\left( \left. \begin{matrix} 0, \frac{1}{2}, \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \, \frac{4 \eta}{\omega^2} \right) , | |||
</math> | |||
where again Re(''ω'') > 0. Details of the restrictions under which the integrals exist have been omitted in both cases. | |||
==Integral transforms based on the G-function== | |||
In general, two functions ''k''(''z'',''y'') and ''h''(''z'',''y'') are called a pair of transform kernels if, for any suitable function ''f''(''z'') or any suitable function ''g''(''z''), the following two relationships hold simultaneously: | |||
:<math> | |||
g(z) = \int_{0}^{\infty} k(z,y) \, f(y) \; dy, \quad | |||
f(z) = \int_{0}^{\infty} h(z,y) \, g(y) \; dy. | |||
</math> | |||
The pair of kernels is said to be symmetric if ''k''(''z'',''y'') = ''h''(''z'',''y''). | |||
===Narain transform=== | |||
{{harvs | txt | first= Roop | last= Narain | year= 1962 | year2= 1963a | year3= 1963b}} showed that the functions: | |||
:<math> | |||
k(z,y) = 2 \gamma \; (zy)^{\gamma - 1/2} \; G_{p+q,\,m+n}^{\,m,\,p} \!\left( \left. \begin{matrix} \mathbf{a_p}, \mathbf{b_q} \\ \mathbf{c_m}, \mathbf{d_n} \end{matrix} \; \right| \, (zy)^{2 \gamma} \right), | |||
</math> | |||
:<math> | |||
h(z,y) = 2 \gamma \; (zy)^{\gamma - 1/2} \; G_{p+q,\,m+n}^{\,n,\,q} \!\left( \left. \begin{matrix} -\mathbf{b_q}, -\mathbf{a_p} \\ -\mathbf{d_n}, -\mathbf{c_m} \end{matrix} \; \right| \, (zy)^{2 \gamma} \right) | |||
</math> | |||
are an asymmetric pair of transform kernels, where ''γ'' > 0, ''n'' − ''p'' = ''m'' − ''q'' > 0, and: | |||
:<math> | |||
\sum_{j=1}^p a_j + \sum_{j=1}^q b_j = \sum_{j=1}^m c_j + \sum_{j=1}^n d_j, | |||
</math> | |||
along with further convergence conditions. In particular, if ''p'' = ''q'', ''m'' = ''n'', ''a''<sub>''j''</sub> + ''b''<sub>''j''</sub> = 0 for ''j'' = 1, 2, ..., ''p'' and ''c''<sub>''j''</sub> + ''d''<sub>''j''</sub> = 0 for ''j'' = 1, 2, ..., ''m'', then the pair of kernels becomes symmetric. The well-known [[Hankel transform]] is a symmetric special case of the Narain transform (''γ'' = 1, ''p'' = ''q'' = 0, ''m'' = ''n'' = 1, ''c''<sub>1</sub> = −''d''<sub>1</sub> = <sup>''ν''</sup>⁄<sub>2</sub>). | |||
===Wimp transform=== | |||
{{harvs | txt | first= Jet | last= Wimp | year= 1964}} showed that these functions are an asymmetric pair of transform kernels: | |||
:<math> | |||
k(z,y) = G_{p+2,\,q}^{\,m,\,n+2} \!\left( \left. \begin{matrix} 1 - \nu + i z, 1 - \nu - i z, \mathbf{a_p} \\ \mathbf{b_q} \end{matrix} \; \right| \; y \right), | |||
</math> | |||
:<math> | |||
h(z,y) = \frac{i}{\pi} y e^{- \nu \pi i} \left[ e^{\pi y} A(\nu + i y, \nu - i y \,|\, z e^{i \pi} ) - e^{- \pi y} A(\nu - i y, \nu + i y \,|\, z e^{i \pi} ) \right], | |||
</math> | |||
where the function ''A''(·) is defined as: | |||
:<math> | |||
A(\alpha, \beta \,|\, z) = G_{p+2,\,q}^{\,q-m,\,p-n+1} \!\left( \left. \begin{matrix} -a_{n+1}, -a_{n+2}, \dots, -a_p, \alpha, -a_1, -a_2, \dots, -a_n, \beta \\ -b_{m+1}, -b_{m+2}, \dots, -b_q, -b_1, -b_2, \dots, -b_m \end{matrix} \; \right| \, z \right). | |||
</math> | |||
===Generalized Laplace transform=== | |||
The [[Laplace transform]] can be generalized in close analogy with Narain's generalization of the Hankel transform: | |||
:<math> | |||
g(s) = 2 \gamma \int_0^{\infty} (st)^{\gamma + \rho - 1/2} \; G_{p,\,q+1}^{\,q+1,\,0} \!\left( \left. \begin{matrix} \mathbf{a_p} \\ 0, \mathbf{b_q} \end{matrix} \; \right| \, (st)^{2 \gamma} \right) f(t) \; dt, | |||
</math> | |||
:<math> | |||
f(t) = \frac {\gamma} {\pi i} \int_{c - i \infty}^{c + i \infty} (ts)^{\gamma - \rho - 1/2} \; G_{p,\,q+1}^{\,1,\,p} \!\left( \left. \begin{matrix} -\mathbf{a_p} \\ 0, -\mathbf{b_q} \end{matrix} \; \right| \, -(ts)^{2 \gamma} \right) g(s) \; ds, | |||
</math> | |||
where ''γ'' > ''0'', ''p'' ≤ ''q'', and: | |||
:<math> | |||
(q+1-p) \, {\rho \over 2 \gamma} = \sum_{j=1}^p a_j - \sum_{j=1}^q b_j, | |||
</math> | |||
and where the constant ''c'' > 0 places the second integration path to the right of any pole in the integrand. For ''γ'' = <sup>1</sup>⁄<sub>2</sub>, ''ρ'' = 0 and ''p'' = ''q'' = 0, this corresponds to the familiar Laplace transform. | |||
===Meijer transform=== | |||
Two particular cases of this generalization were given by C.S. Meijer in 1940 and 1941. The case resulting for ''γ'' = 1, ''ρ'' = −''ν'', ''p'' = 0, ''q'' = 1 and ''b''<sub>1</sub> = ''ν'' may be written {{harvs | last= Meijer | year= 1940}}: | |||
:<math> | |||
g(s) = \sqrt {2 / \pi} \int_0^{\infty} (st)^{1/2} \, K_{\nu}(st) \, f(t) \; dt, | |||
</math> | |||
:<math> | |||
f(t) = \frac {1} {\sqrt {2 \pi} \,i} \int_{c - i \infty}^{c + i \infty} (ts)^{1/2} \, I_{\nu}(ts) \, g(s) \; ds, | |||
</math> | |||
and the case obtained for ''γ'' = <sup>1</sup>⁄<sub>2</sub>, ''ρ'' = −''m'' − ''k'', ''p'' = ''q'' = 1, ''a''<sub>1</sub> = ''m'' − ''k'' and ''b''<sub>1</sub> = 2''m'' may be written {{harvs | last= Meijer | year= 1941a}}: | |||
:<math> | |||
g(s) = \int_0^{\infty} (st)^{-k-1/2} \, e^{-st/2} \, W_{k+1/2,\,m}(st) \, f(t) \; dt, | |||
</math> | |||
:<math> | |||
f(t) = \frac {\Gamma(1-k+m)} {2 \pi i \, \Gamma(1+2m)} \int_{c - i \infty}^{c + i \infty} (ts)^{k-1/2} \, e^{ts/2} \, M_{k-1/2,\,m}(ts) \, g(s) \; ds. | |||
</math> | |||
Here ''I''<sub>''ν''</sub> and ''K''<sub>''ν''</sub> are the [[Bessel function|modified Bessel functions]] of the first and second kind, respectively, ''M''<sub>''k'',''m''</sub> and ''W''<sub>''k'',''m''</sub> are the [[Whittaker function]]s, and constant scale factors have been applied to the functions ''f'' and ''g'' and their arguments ''s'' and ''t'' in the first case. | |||
==Representation of other functions in terms of the G-function== | |||
The following list shows how the familiar [[elementary function]]s result as special cases of the Meijer G-function: | |||
:<math> H(1-|x|) = G_{1,1}^{\,1,0} \!\left( \left. \begin{matrix} 1 \\ 0 \end{matrix} \; \right| \, x \right), \qquad \forall x </math> | |||
:<math> H(|x|-1) = G_{1,1}^{\,0,1} \!\left( \left. \begin{matrix} 1 \\ 0 \end{matrix} \; \right| \, x \right), \qquad \forall x </math> | |||
:<math> e^x = G_{0,1}^{\,1,0} \!\left( \left. \begin{matrix} - \\ 0 \end{matrix} \; \right| \, -x \right), \qquad \forall x </math> | |||
:<math> \cos x = \sqrt{\pi} \; G_{0,2}^{\,1,0} \!\left( \left. \begin{matrix} - \\ 0,\frac{1}{2} \end{matrix} \; \right| \, \frac{x^2}{4} \right), \qquad \forall x </math> | |||
:<math> \sin x = \sqrt{\pi} \; G_{0,2}^{\,1,0} \!\left( \left. \begin{matrix} - \\ \frac{1}{2},0 \end{matrix} \; \right| \, \frac{x^2}{4} \right), \qquad \frac{-\pi}{2} < \arg x \leq \frac{\pi}{2} </math> | |||
:<math> \cosh x = \sqrt{\pi} \; G_{0,2}^{\,1,0} \!\left( \left. \begin{matrix} - \\ 0,\frac{1}{2} \end{matrix} \; \right| \, -\frac{x^2}{4} \right), \qquad \forall x </math> | |||
:<math> \sinh x = -\sqrt{\pi}i \; G_{0,2}^{\,1,0} \!\left( \left. \begin{matrix} - \\ \frac{1}{2},0 \end{matrix} \; \right| \, -\frac{x^2}{4} \right), \qquad -\pi < \arg x \leq 0 </math> | |||
:<math> \arcsin x = \frac{-i}{2\sqrt{\pi}} \; G_{2,2}^{\,1,2} \!\left( \left. \begin{matrix} 1,1 \\ \frac{1}{2},0 \end{matrix} \; \right| \, -x^2 \right), \qquad -\pi < \arg x \leq 0 </math> | |||
:<math> \arctan x = \frac{1}{2} \; G_{2,2}^{\,1,2} \!\left( \left. \begin{matrix} \frac{1}{2},1 \\ \frac{1}{2},0 \end{matrix} \; \right| \, x^2 \right), \qquad \frac{-\pi}{2} < \arg x \leq \frac{\pi}{2} </math> | |||
:<math> \arccot x = \frac{1}{2} \; G_{2,2}^{\,2,1} \!\left( \left. \begin{matrix} \frac{1}{2},1 \\ \frac{1}{2},0 \end{matrix} \; \right| \, x^2 \right), \qquad \frac{-\pi}{2} < \arg x \leq \frac{\pi}{2} </math> | |||
:<math> \ln (1+x) = G_{2,2}^{\,1,2} \!\left( \left. \begin{matrix} 1,1 \\ 1,0 \end{matrix} \; \right| \, x \right), \qquad \forall x </math> | |||
Here, ''H'' denotes the [[Heaviside step function]]. | |||
The subsequent list shows how some [[special function|higher function]]s can be expressed in terms of the G-function: | |||
:<math> \gamma (\alpha,x) = G_{1,2}^{\,1,1} \!\left( \left. \begin{matrix} 1 \\ \alpha,0 \end{matrix} \; \right| \, x \right), \qquad \forall x </math> | |||
:<math> \Gamma (\alpha,x) = G_{1,2}^{\,2,0} \!\left( \left. \begin{matrix} 1 \\ \alpha,0 \end{matrix} \; \right| \, x \right), \qquad \forall x </math> | |||
:<math> J_\nu (x) = G_{0,2}^{\,1,0} \!\left( \left. \begin{matrix} - \\ \frac{\nu}{2}, \frac{-\nu}{2} \end{matrix} \; \right| \, \frac{x^2}{4} \right), \qquad \frac{-\pi}{2} < \arg x \leq \frac{\pi}{2} </math> | |||
:<math> Y_\nu (x) = G_{1,3}^{\,2,0} \!\left( \left. \begin{matrix} \frac{- \nu - 1}{2} \\ \frac{\nu}{2}, \frac{-\nu}{2}, \frac{- \nu - 1}{2} \end{matrix} \; \right| \, \frac{x^2}{4} \right), \qquad \frac{-\pi}{2} < \arg x \leq \frac{\pi}{2} </math> | |||
:<math> I_\nu (x) = i^{-\nu} \; G_{0,2}^{\,1,0} \!\left( \left. \begin{matrix} - \\ \frac{\nu}{2}, \frac{-\nu}{2} \end{matrix} \; \right| \, -\frac{x^2}{4} \right), \qquad -\pi < \arg x \leq 0 </math> | |||
:<math> K_\nu (x) = \frac{1}{2} \; G_{0,2}^{\,2,0} \!\left( \left. \begin{matrix} - \\ \frac{\nu}{2}, \frac{-\nu}{2} \end{matrix} \; \right| \, \frac{x^2}{4} \right), \qquad \frac{-\pi}{2} < \arg x \leq \frac{\pi}{2} </math> | |||
:<math> \Phi (x,n,a) = G_{n+1,\,n+1}^{\,1,\,n+1} \!\left( \left. \begin{matrix} 0, 1-a, \dots, 1-a \\ 0, -a, \dots, -a \end{matrix} \; \right| \, -x \right), \qquad \forall x, \; n = 0,1,2,\dots </math> | |||
:<math> \Phi (x,-n,a) = G_{n+1,\,n+1}^{\,1,\,n+1} \!\left( \left. \begin{matrix} 0, -a, \dots, -a \\ 0, 1-a, \dots, 1-a \end{matrix} \; \right| \, -x \right), \qquad \forall x, \; n = 0,1,2,\dots </math> | |||
Even the [[incomplete gamma function#Derivatives|derivatives of γ(''α'',''x'') and Γ(''α'',''x'') with respect to ''α'']] can be expressed in terms of the Meijer G-function. Here, γ and Γ are the lower and upper [[incomplete gamma function]]s, ''J''<sub>''ν''</sub> and ''Y''<sub>''ν''</sub> are the [[Bessel function]]s of the first and second kind, respectively, ''I''<sub>''ν''</sub> and ''K''<sub>''ν''</sub> are the corresponding modified Bessel functions, and Φ is the [[Lerch transcendent]]. | |||
==References== | |||
* {{cite book | last= Andrews | first= L. C. | title= Special Functions for Engineers and Applied Mathematicians | location= New York | publisher= MacMillan | year= 1985 | isbn= 0-02-948650-5 | ref= harv}} | |||
* {{dlmf | id= 16.17 | first= R. A. | last= Askey | authorlink1=Richard Askey | first2= Adri B. Olde | last2= Daalhuis}} | |||
* {{cite book | last1= Bateman | first1= H. | author1-link= Harry Bateman | last2= Erdélyi | first2= A. | author2-link= Arthur Erdélyi | title= Higher Transcendental Functions, Vol. I | url= http://apps.nrbook.com/bateman/Vol1.pdf | format = PDF | location= New York | publisher= McGraw–Hill | year= 1953 | ref= harv}} (see § 5.3, "Definition of the G-Function", p. 206) | |||
* {{eom | id= Meijer_transform&oldid=12567 | title= Meijer transform | first= Yu. A. | last= Brychkov | first2= A. P. | last2= Prudnikov}} | |||
* {{cite book | last1= Gradshteyn | first1= Izrail' Solomonovich | last2= Ryzhik | first2= Iosif Moiseevich | title= Tablitsy integralov, summ, ryadov i proizvedeniy [Tables of integrals, sums, series and products] | language= Russian | edition= 5th | location= Moscow | publisher= Nauka | year= 1971 | ref= harv}} (see Chapter 9.3) | |||
* {{eom | id= Meijer-G-functions&oldid=13688 | title= Meijer G-functions | first= A. U. | last= Klimyk}} | |||
* {{cite book | last= Luke | first= Yudell L. | authorlink=Yudell Luke | title= The Special Functions and Their Approximations, Vol. I | location= New York | publisher= Academic Press | year= 1969 | isbn= 0-12-459901-X | ref= harv}} (see Chapter V, "The Generalized Hypergeometric Function and the G-Function", p. 136) | |||
* {{cite journal | last= Meijer | first= C. S. | author-link= Cornelis Simon Meijer | title= Über Whittakersche bzw. Besselsche Funktionen und deren Produkte | language= German | journal= Nieuw Archief voor Wiskunde (2) | volume= 18 | issue= 4 | pages= 10–39 | year= 1936 | jfm= 62.0421.02 | ref= harv}} | |||
* {{cite journal | last= Meijer | first= C. S. | title= Über eine Erweiterung der Laplace-Transformation – I, II | language= German | journal= Proceedings of the Section of Sciences, Koninklijke Akademie van Wetenschappen (Amsterdam) | volume= 43 | issue= | pages= 599–608 and 702–711 | year= 1940 | jfm= 66.0523.01 | ref= harv}} | |||
* {{cite journal | last= Meijer | first= C. S. | title= Eine neue Erweiterung der Laplace-Transformation – I, II | language= German | journal= Proceedings of the Section of Sciences, Koninklijke Akademie van Wetenschappen (Amsterdam) | volume= 44 | issue= | pages= 727–737 and 831–839 | year= 1941a | jfm= 67.0396.01 | ref= harv}} | |||
* {{cite journal | last= Meijer | first= C. S. | title= Multiplikationstheoreme für die Funktion <math> \scriptstyle G_{p,q}^{\,m,n}(z) </math> | language= German | journal= Proceedings of the Section of Sciences, Koninklijke Akademie van Wetenschappen (Amsterdam) | volume= 44 | issue= | pages= 1062–1070 | year= 1941b | jfm= 67.1016.01 | ref= harv}} | |||
* {{cite journal | last= Narain | first= Roop | title= The G-functions as unsymmetrical Fourier kernels – I | url= http://www.ams.org/journals/proc/1962-013-06/S0002-9939-1962-0144157-5/S0002-9939-1962-0144157-5.pdf | format= PDF | journal= Proceedings of the American Mathematical Society | volume= 13 | issue= 6 | pages= 950–959 | year= 1962 | doi= 10.1090/S0002-9939-1962-0144157-5 | mr= 0144157 | ref= harv}} | |||
* {{cite journal | last= Narain | first= Roop | title= The G-functions as unsymmetrical Fourier kernels – II | url= http://www.ams.org/journals/proc/1963-014-01/S0002-9939-1963-0145263-2/S0002-9939-1963-0145263-2.pdf | format= PDF | journal= Proceedings of the American Mathematical Society | volume= 14 | issue= 1 | pages= 18–28 | year= 1963a | doi= 10.1090/S0002-9939-1963-0145263-2 | mr= 0145263 | ref= harv}} | |||
* {{cite journal | last= Narain | first= Roop | title= The G-functions as unsymmetrical Fourier kernels – III | url= http://www.ams.org/journals/proc/1963-014-02/S0002-9939-1963-0149210-9/S0002-9939-1963-0149210-9.pdf | format= PDF | journal= Proceedings of the American Mathematical Society | volume= 14 | issue= 2 | pages= 271–277 | year= 1963b | doi= 10.1090/S0002-9939-1963-0149210-9 | mr= 0149210 | ref= harv}} | |||
* {{cite book | last= Prudnikov | first= A. P. | coauthors= Marichev, O. I.; and Brychkov, Yu. A. | title= Integrals and Series, Vol. 3: More Special Functions | location= Newark, NJ | publisher= Gordon and Breach | year= 1990 | isbn= 2-88124-682-6 | ref= harv}} (see § 8.2, "The Meijer G-function", p. 617) | |||
* {{cite book | last= Slater | first= Lucy Joan | authorlink= Lucy Joan Slater | title= Generalized hypergeometric functions | location= Cambridge, UK | publisher= Cambridge University Press | year= 1966 | isbn= 0-521-06483-X | ref= harv}} (there is a 2008 paperback with ISBN 978-0-521-09061-2) | |||
* {{cite journal | last= Wimp | first= Jet | title= A Class of Integral Transforms | journal= Proceedings of the Edinburgh Mathematical Society (Series 2) | volume= 14 | issue= | pages= 33–40 | year= 1964 | doi= 10.1017/S0013091500011202 | mr= 0164204 | zbl= 0127.05701 | ref= harv}} | |||
==External links== | |||
* {{mathworld | urlname= MeijerG-Function | title= Meijer G-Function}} | |||
* [[:de:Gradshteyn-Ryzhik|Gradshteyn-Ryzhik (German Wikipedia)]] | |||
[[Category:Hypergeometric functions]] |
Latest revision as of 01:57, 16 March 2013
In mathematics, the G-function was introduced by Template:Harvs as a very general function intended to include most of the known special functions as particular cases. This was not the only attempt of its kind: the generalized hypergeometric function and the MacRobert E-function had the same aim, but Meijer's G-function was able to include those as particular cases as well. The first definition was made by Meijer using a series; nowadays the accepted and more general definition is via a path integral in the complex plane, introduced in its full generality by Arthur Erdélyi in 1953.
With the modern definition, the majority of the established special functions can be represented in terms of the Meijer G-function. A notable property is the closure of the set of all G-functions not only under differentiation but also under indefinite integration. In combination with a functional equation that allows to liberate from a G-function G(z) any factor zρ that is a constant power of its argument z, the closure implies that whenever a function is expressible as a G-function of a constant multiple of some constant power of the function argument, f(x) = G(cxγ), the derivative and the antiderivative of this function are expressible so too.
The wide coverage of special functions also lends power to uses of Meijer's G-function other than the representation and manipulation of derivatives and antiderivatives. Thus, the definite integral over the positive real axis of any function g(x) that can be written as a product G1(cxγ)·G2(dxδ) of two G-functions with rational γ/δ equals just another G-function, and generalizations of integral transforms like the Hankel transform and the Laplace transform and their inverses result when suitable G-function pairs are employed as transform kernels.
A still more general function, which introduces additional parameters into Meijer's G-function, is Fox's H-function.
Definition of the Meijer G-function
A general definition of the Meijer G-function is given by the following line integral in the complex plane Template:Harv:
where Γ denotes the gamma function. This integral is of the so-called Mellin–Barnes type, and may be viewed as an inverse Mellin transform. The definition holds under the following assumptions:
- 0 ≤ m ≤ q and 0 ≤ n ≤ p, where m, n, p and q are integer numbers
- ak − bj ≠ 1, 2, 3, ... for k = 1, 2, ..., n and j = 1, 2, ..., m, which implies that no pole of any Γ(bj − s), j = 1, 2, ..., m, coincides with any pole of any Γ(1 − ak + s), k = 1, 2, ..., n
- z ≠ 0
Note that for historical reasons the first lower and second upper index refer to the top parameter row, while the second lower and first upper index refer to the bottom parameter row. One often encounters the following more synthetic notation using vectors:
Implementations of the G-function in computer algebra systems typically employ separate vector arguments for the four (possibly empty) parameter groups a1 ... an, an+1 ... ap, b1 ... bm, and bm+1 ... bq, and thus can omit the orders p, q, n, and m as redundant.
The L in the integral represents the path to be followed while integrating. Three choices are possible for this path:
- 1. L runs from −i∞ to +i∞ such that all poles of Γ(bj − s), j = 1, 2, ..., m, are on the right of the path, while all poles of Γ(1 − ak + s), k = 1, 2, ..., n, are on the left. The integral then converges for |arg z| < δ π, where
- an obvious prerequisite for this is δ > 0. The integral additionally converges for |arg z| = δ π ≥ 0 if (q − p) (σ + 1⁄2) > Re(ν) + 1, where σ represents Re(s) as the integration variable s approaches both +i∞ and −i∞, and where
- As a corollary, for |arg z| = δ π and p = q the integral converges independent of σ whenever Re(ν) < −1.
- 2. L is a loop beginning and ending at +∞, encircling all poles of Γ(bj − s), j = 1, 2, ..., m, exactly once in the negative direction, but not encircling any pole of Γ(1 − ak + s), k = 1, 2, ..., n. Then the integral converges for all z if q > p ≥ 0; it also converges for q = p > 0 as long as |z| < 1. In the latter case, the integral additionally converges for |z| = 1 if Re(ν) < −1, where ν is defined as for the first path.
- 3. L is a loop beginning and ending at −∞ and encircling all poles of Γ(1 − ak + s), k = 1, 2, ..., n, exactly once in the positive direction, but not encircling any pole of Γ(bj − s), j = 1, 2, ..., m. Now the integral converges for all z if p > q ≥ 0; it also converges for p = q > 0 as long as |z| > 1. As noted for the second path too, in the case of p = q the integral also converges for |z| = 1 when Re(ν) < −1.
The conditions for convergence are readily established by applying Stirling's asymptotic approximation to the gamma functions in the integrand. When the integral converges for more than one of these paths, the results of integration can be shown to agree; if it converges for only one path, then this is the only one to be considered. In fact, numerical path integration in the complex plane constitutes a practicable and sensible approach to the calculation of Meijer G-functions.
As a consequence of this definition, the Meijer G-function is an analytic function of z with possible exception of the origin z = 0 and of the unit circle |z| = 1.
Differential equation
The G-function satisfies the following linear differential equation of order max(p,q):
For a fundamental set of solutions of this equation in the case of p ≤ q one may take:
and similarly in the case of p ≥ q:
These particular solutions are analytic except for a possible singularity at z = 0 (as well as a possible singularity at z = ∞), and in the case of p = q also an inevitable singularity at z = (−1)p−m−n. As will be seen presently, they can be identified with generalized hypergeometric functions pFq−1 of argument (−1)p−m−n z that are multiplied by a power zbh, and with generalized hypergeometric functions qFp−1 of argument (−1)q−m−n z−1 that are multiplied by a power zah−1, respectively.
Relationship between the G-function and the generalized hypergeometric function
If the integral converges when evaluated along the second path introduced above, and if no confluent poles appear among the Γ(bj − s), j = 1, 2, ..., m, then the Meijer G-function can be expressed as a sum of residues in terms of generalized hypergeometric functions pFq−1 (Slater's theorem):
For the integral to converge along the second path one must have either p < q, or p = q and |z| < 1, and for the poles to be distinct no pair among the bj, j = 1, 2, ..., m, may differ by an integer or zero. The asterisks in the relation remind us to ignore the contribution with index j = h as follows: In the product this amounts to replacing Γ(0) with 1, and in the argument of the hypergeometric function, if we recall the meaning of the vector notation,
this amounts to shortening the vector length from q to q−1.
Note that when m = 0, the second path does not contain any pole, and so the integral must vanish identically,
if either p < q, or p = q and |z| < 1.
Similarly, if the integral converges when evaluated along the third path above, and if no confluent poles appear among the Γ(1 − ak + s), k = 1, 2, ..., n, then the G-function can be expressed as:
For this, either p > q, or p = q and |z| > 1 are required, and no pair among the ak, k = 1, 2, ..., n, may differ by an integer or zero. For n = 0 one consequently has:
if either p > q, or p = q and |z| > 1.
On the other hand, any generalized hypergeometric function can readily be expressed in terms of the Meijer G-function:
where we have made use of the vector notation:
This holds unless a nonpositive integer value of at least one of its parameters ap reduces the hypergeometric function to a finite polynomial, in which case the gamma prefactor of either G-function vanishes and the parameter sets of the G-functions violate the requirement ak − bj ≠ 1, 2, 3, ... for k = 1, 2, ..., n and j = 1, 2, ..., m from the definition above. Apart from this restriction, the relationship is valid whenever the generalized hypergeometric series pFq(z) converges, i. e. for any finite z when p ≤ q, and for |z| < 1 when p = q + 1. In the latter case, the relation with the G-function automatically provides the analytic continuation of pFq(z) to |z| ≥ 1 with a branch cut from 1 to ∞ along the real axis. Finally, the relation furnishes a natural extension of the definition of the hypergeometric function to orders p > q + 1. By means of the G-function we can thus solve the generalized hypergeometric differential equation for p > q + 1 as well.
Polynomial cases
To express polynomial cases of generalized hypergeometric functions in terms of Meijer G-functions, a linear combination of two G-functions is needed in general:
where h = 0, 1, 2, ... equals the degree of the polynomial p+1Fq(z). The orders m and n can be chosen freely in the ranges 0 ≤ m ≤ q and 0 ≤ n ≤ p, which allows to avoid that specific integer values or integer differences among the parameters ap and bq of the polynomial give rise to divergent gamma functions in the prefactor or to a conflict with the definition of the G-function. Note that the first G-function vanishes for n = 0 if p > q, while the second G-function vanishes for m = 0 if p < q. Again, the formula can be verified by expressing the two G-functions as sums of residues; no cases of confluent poles permitted by the definition of the G-function need be excluded here.
Basic properties of the G-function
As can be seen from the definition of the G-function, if equal parameters appear among the ap and bq determining the factors in the numerator and the denominator of the integrand, the fraction can be simplified, and the order of the function thereby be reduced. Whether the order m or n will decrease depends of the particular position of the parameters in question. Thus, if one of the ak, k = 1, 2, ..., n, equals one of the bj, j = m + 1, ..., q, the G-function lowers its orders p, q and n:
For the same reason, if one of the ak, k = n + 1, ..., p, equals one of the bj, j = 1, 2, ..., m, then the G-function lowers its orders p, q and m:
Starting from the definition, it is also possible to derive the following properties:
The abbreviations ν and δ were introduced in the definition of the G-function above.
Derivatives and antiderivatives
Concerning derivatives of the G-function, one finds these relationships:
From these four, equivalent relations can be deduced by simply evaluating the derivative on the left-hand side and manipulating a bit. One obtains for example:
Moreover, for derivatives of arbitrary order h, one has
which hold for h < 0 as well, thus allowing to obtain the antiderivative of any G-function as easily as the derivative. By choosing one or the other of the two results provided in either formula, one can always prevent the set of parameters in the result from violating the condition ak − bj ≠ 1, 2, 3, ... for k = 1, 2, ..., n and j = 1, 2, ..., m that is imposed by the definition of the G-function. Note that each pair of results becomes unequal in the case of h < 0.
From these relationships, corresponding properties of the Gauss hypergeometric function and of other special functions can be derived.
Recurrence relations
By equating different expressions for the first-order derivatives, one arrives at the following 3-term recurrence relations among contiguous G-functions:
Similar relations for the diagonal parameter pairs a1, bq and b1, ap follow by suitable combination of the above. Again, corresponding properties of hypergeometric and other special functions can be derived from these recurrence relations.
Multiplication theorems
Provided that z ≠ 0, the following relationships hold:
These follow by Taylor expansion about w = 1, with the help of the basic properties discussed above. The radii of convergence will be dependent on the value of z and on the G-function that is expanded. The expansions can be regarded as generalizations of similar theorems for Bessel, hypergeometric and confluent hypergeometric functions.
Definite integrals involving the G-function
Among definite integrals involving an arbitrary G-function one has:
Note that the restrictions under which this integral exists have been omitted here. It is, of course, no surprise that the Mellin transform of a G-function should lead back to the integrand appearing in the definition above.
Euler-type integrals for the G-function are given by:
Here too, the restrictions under which the integrals exist have been omitted. Note that, in view of their effect on the G-function, these integrals can be used to define the operation of fractional integration for a fairly large class of functions (Erdélyi–Kober operators).
A result of fundamental importance is that the product of two arbitrary G-functions integrated over the positive real axis can be represented by just another G-function (convolution theorem):
Again, the restrictions under which the integral exists have been omitted here. Note how the Mellin transform of the result merely assembles the gamma factors from the Mellin transforms of the two functions in the integrand. Many of the amazing definite integrals listed in tables or produced by computer algebra systems are nothing but special cases of this formula.
The convolution formula can be derived by substituting the defining Mellin–Barnes integral for one of the G-functions, reversing the order of integration, and evaluating the inner Mellin-transform integral. The preceding Euler-type integrals follow analogously.
Laplace transform
Using the above convolution integral and basic properties one can show that:
where Re(ω) > 0. This is the Laplace transform of a function G(ηx) multiplied by a power x−α; if we put α = 0 we get the Laplace transform of the G-function. As usual, the inverse transform is then given by:
where c is a real positive constant that places the integration path to the right of any pole in the integrand.
Another formula for the Laplace transform of a G-function is:
where again Re(ω) > 0. Details of the restrictions under which the integrals exist have been omitted in both cases.
Integral transforms based on the G-function
In general, two functions k(z,y) and h(z,y) are called a pair of transform kernels if, for any suitable function f(z) or any suitable function g(z), the following two relationships hold simultaneously:
The pair of kernels is said to be symmetric if k(z,y) = h(z,y).
Narain transform
Template:Harvs showed that the functions:
are an asymmetric pair of transform kernels, where γ > 0, n − p = m − q > 0, and:
along with further convergence conditions. In particular, if p = q, m = n, aj + bj = 0 for j = 1, 2, ..., p and cj + dj = 0 for j = 1, 2, ..., m, then the pair of kernels becomes symmetric. The well-known Hankel transform is a symmetric special case of the Narain transform (γ = 1, p = q = 0, m = n = 1, c1 = −d1 = ν⁄2).
Wimp transform
Template:Harvs showed that these functions are an asymmetric pair of transform kernels:
where the function A(·) is defined as:
Generalized Laplace transform
The Laplace transform can be generalized in close analogy with Narain's generalization of the Hankel transform:
where γ > 0, p ≤ q, and:
and where the constant c > 0 places the second integration path to the right of any pole in the integrand. For γ = 1⁄2, ρ = 0 and p = q = 0, this corresponds to the familiar Laplace transform.
Meijer transform
Two particular cases of this generalization were given by C.S. Meijer in 1940 and 1941. The case resulting for γ = 1, ρ = −ν, p = 0, q = 1 and b1 = ν may be written Template:Harvs:
and the case obtained for γ = 1⁄2, ρ = −m − k, p = q = 1, a1 = m − k and b1 = 2m may be written Template:Harvs:
Here Iν and Kν are the modified Bessel functions of the first and second kind, respectively, Mk,m and Wk,m are the Whittaker functions, and constant scale factors have been applied to the functions f and g and their arguments s and t in the first case.
Representation of other functions in terms of the G-function
The following list shows how the familiar elementary functions result as special cases of the Meijer G-function:
Here, H denotes the Heaviside step function.
The subsequent list shows how some higher functions can be expressed in terms of the G-function:
Even the derivatives of γ(α,x) and Γ(α,x) with respect to α can be expressed in terms of the Meijer G-function. Here, γ and Γ are the lower and upper incomplete gamma functions, Jν and Yν are the Bessel functions of the first and second kind, respectively, Iν and Kν are the corresponding modified Bessel functions, and Φ is the Lerch transcendent.
References
- 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
My blog: http://www.primaboinca.com/view_profile.php?userid=5889534 - Template:Dlmf
- 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
My blog: http://www.primaboinca.com/view_profile.php?userid=5889534 (see § 5.3, "Definition of the G-Function", p. 206) - Template:Eom
- 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
My blog: http://www.primaboinca.com/view_profile.php?userid=5889534 (see Chapter 9.3) - Template:Eom
- 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
My blog: http://www.primaboinca.com/view_profile.php?userid=5889534 (see Chapter V, "The Generalized Hypergeometric Function and the G-Function", p. 136) - One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting
In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang
Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules
Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.
A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running
The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more
There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang - One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting
In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang
Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules
Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.
A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running
The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more
There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang - One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting
In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang
Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules
Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.
A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running
The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more
There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang - One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting
In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang
Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules
Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.
A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running
The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more
There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang - One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting
In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang
Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules
Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.
A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running
The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more
There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang - One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting
In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang
Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules
Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.
A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running
The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more
There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang - One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting
In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang
Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules
Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.
A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running
The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more
There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang - 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
My blog: http://www.primaboinca.com/view_profile.php?userid=5889534 (see § 8.2, "The Meijer G-function", p. 617) - 20 year-old Real Estate Agent Rusty from Saint-Paul, has hobbies and interests which includes monopoly, property developers in singapore and poker. Will soon undertake a contiki trip that may include going to the Lower Valley of the Omo.
My blog: http://www.primaboinca.com/view_profile.php?userid=5889534 (there is a 2008 paperback with ISBN 978-0-521-09061-2) - One of the biggest reasons investing in a Singapore new launch is an effective things is as a result of it is doable to be lent massive quantities of money at very low interest rates that you should utilize to purchase it. Then, if property values continue to go up, then you'll get a really high return on funding (ROI). Simply make sure you purchase one of the higher properties, reminiscent of the ones at Fernvale the Riverbank or any Singapore landed property Get Earnings by means of Renting
In its statement, the singapore property listing - website link, government claimed that the majority citizens buying their first residence won't be hurt by the new measures. Some concessions can even be prolonged to chose teams of consumers, similar to married couples with a minimum of one Singaporean partner who are purchasing their second property so long as they intend to promote their first residential property. Lower the LTV limit on housing loans granted by monetary establishments regulated by MAS from 70% to 60% for property purchasers who are individuals with a number of outstanding housing loans on the time of the brand new housing purchase. Singapore Property Measures - 30 August 2010 The most popular seek for the number of bedrooms in Singapore is 4, followed by 2 and three. Lush Acres EC @ Sengkang
Discover out more about real estate funding in the area, together with info on international funding incentives and property possession. Many Singaporeans have been investing in property across the causeway in recent years, attracted by comparatively low prices. However, those who need to exit their investments quickly are likely to face significant challenges when trying to sell their property – and could finally be stuck with a property they can't sell. Career improvement programmes, in-house valuation, auctions and administrative help, venture advertising and marketing, skilled talks and traisning are continuously planned for the sales associates to help them obtain better outcomes for his or her shoppers while at Knight Frank Singapore. No change Present Rules
Extending the tax exemption would help. The exemption, which may be as a lot as $2 million per family, covers individuals who negotiate a principal reduction on their existing mortgage, sell their house short (i.e., for lower than the excellent loans), or take part in a foreclosure course of. An extension of theexemption would seem like a common-sense means to assist stabilize the housing market, but the political turmoil around the fiscal-cliff negotiations means widespread sense could not win out. Home Minority Chief Nancy Pelosi (D-Calif.) believes that the mortgage relief provision will be on the table during the grand-cut price talks, in response to communications director Nadeam Elshami. Buying or promoting of blue mild bulbs is unlawful.
A vendor's stamp duty has been launched on industrial property for the primary time, at rates ranging from 5 per cent to 15 per cent. The Authorities might be trying to reassure the market that they aren't in opposition to foreigners and PRs investing in Singapore's property market. They imposed these measures because of extenuating components available in the market." The sale of new dual-key EC models will even be restricted to multi-generational households only. The models have two separate entrances, permitting grandparents, for example, to dwell separately. The vendor's stamp obligation takes effect right this moment and applies to industrial property and plots which might be offered inside three years of the date of buy. JLL named Best Performing Property Brand for second year running
The data offered is for normal info purposes only and isn't supposed to be personalised investment or monetary advice. Motley Fool Singapore contributor Stanley Lim would not personal shares in any corporations talked about. Singapore private home costs increased by 1.eight% within the fourth quarter of 2012, up from 0.6% within the earlier quarter. Resale prices of government-built HDB residences which are usually bought by Singaporeans, elevated by 2.5%, quarter on quarter, the quickest acquire in five quarters. And industrial property, prices are actually double the levels of three years ago. No withholding tax in the event you sell your property. All your local information regarding vital HDB policies, condominium launches, land growth, commercial property and more
There are various methods to go about discovering the precise property. Some local newspapers (together with the Straits Instances ) have categorised property sections and many local property brokers have websites. Now there are some specifics to consider when buying a 'new launch' rental. Intended use of the unit Every sale begins with 10 p.c low cost for finish of season sale; changes to 20 % discount storewide; follows by additional reduction of fiftyand ends with last discount of 70 % or extra. Typically there is even a warehouse sale or transferring out sale with huge mark-down of costs for stock clearance. Deborah Regulation from Expat Realtor shares her property market update, plus prime rental residences and houses at the moment available to lease Esparina EC @ Sengkang
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- 22 year-old Systems Analyst Rave from Merrickville-Wolford, has lots of hobbies and interests including quick cars, property developers in singapore and baking. Always loves visiting spots like Historic Monuments Zone of Querétaro.
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