Equivalent dose

In mathematics, spectral theory is an inclusive term for theories extending the eigenvector and eigenvalue theory of a single square matrix to a much broader theory of the structure of operators in a variety of mathematical spaces. It is a result of studies of linear algebra and the solutions of systems of linear equations and their generalizations. The theory is connected to that of analytic functions because the spectral properties of an operator are related to analytic functions of the spectral parameter.

Mathematical background

The name spectral theory was introduced by David Hilbert in his original formulation of Hilbert space theory, which was cast in terms of quadratic forms in infinitely many variables. The original spectral theorem was therefore conceived as a version of the theorem on principal axes of an ellipsoid, in an infinite-dimensional setting. The later discovery in quantum mechanics that spectral theory could explain features of atomic spectra was therefore fortuitous.

There have been three main ways to formulate spectral theory, all of which retain their usefulness. After Hilbert's initial formulation, the later development of abstract Hilbert space and the spectral theory of a single normal operator on it did very much go in parallel with the requirements of physics; particularly at the hands of von Neumann. The further theory built on this to include Banach algebras, which can be given abstractly. This development leads to the Gelfand representation, which covers the commutative case, and further into non-commutative harmonic analysis.

The difference can be seen in making the connection with Fourier analysis. The Fourier transform on the real line is in one sense the spectral theory of differentiation qua differential operator. But for that to cover the phenomena one has already to deal with generalized eigenfunctions (for example, by means of a rigged Hilbert space). On the other hand it is simple to construct a group algebra, the spectrum of which captures the Fourier transform's basic properties, and this is carried out by means of Pontryagin duality.

One can also study the spectral properties of operators on Banach spaces. For example, compact operators on Banach spaces have many spectral properties similar to that of matrices.

Physical background

The background in the physics of vibrations has been explained in this way:

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A definition of spectrum

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$R_{\zeta }={(\zeta I-T)}^{-1}.$

Here I is the identity operator and ζ is a complex number. The inverse of an operator T, that is T⁻¹, is defined by:

$T{T}^{-1}=T^{-1}T=I.$

If the inverse exists, T is called regular. If it does not exist, T is called singular.

With these definitions, the resolvent set of T is the set of all complex numbers ζ such that R_ζ exists and is bounded. This set often is denoted as ρ(T). The spectrum of T is the set of all complex numbers ζ such that R_ζ fails to exist or is unbounded. Often the spectrum of T is denoted by σ(T). The function R_ζ for all ζ in ρ(T) (that is, wherever R_ζ exists as a bounded operator) is called the resolvent of T. The spectrum of T is therefore the complement of the resolvent set of T in the complex plane. Every eigenvalue of T belongs to σ(T), but σ(T) may contain non-eigenvalues.

This definition applies to a Banach space, but of course other types of space exist as well, for example, topological vector spaces include Banach spaces, but can be more general. On the other hand, Banach spaces include Hilbert spaces, and it is these spaces that find the greatest application and the richest theoretical results. With suitable restrictions, much can be said about the structure of the spectra of transformations in a Hilbert space. In particular, for self-adjoint operators, the spectrum lies on the real line and (in general) is a spectral combination of a point spectrum of discrete eigenvalues and a continuous spectrum.

Spectral theory briefly

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This topic is easiest to describe by introducing the bra-ket notation of Dirac for operators. As an example, a very particular linear operator L might be written as a dyadic product:

$L=|k_1⟩⟨b_1|,$

in terms of the "bra" $⟨b_1|$ and the "ket" $|k_1⟩$ . A function f is described by a ket as $|f⟩$. The function f(x) defined on the coordinates $(x_1,x_2,x_3,\dots )$ is denoted as:

$f(x)=⟨x,f⟩$

and the magnitude of f by:

$\Vert f{\Vert }^2=⟨f,f⟩=\int ⟨f,x⟩⟨x,f⟩dx=\int f^{*}(x)f(x)dx$

where the notation '*' denotes a complex conjugate. This inner product choice defines a very specific inner product space, restricting the generality of the arguments that follow.

The effect of L upon a function f is then described as:

$L|f⟩=|k_1⟩⟨b_1|f⟩$

expressing the result that the effect of L on f is to produce a new function $|k_1⟩$ multiplied by the inner product represented by $⟨b_1|f⟩$.

A more general linear operator L might be expressed as:

$L={\lambda }_1|e_1⟩⟨f_1|+{\lambda }_2|e_2⟩⟨f_2|+{\lambda }_3|e_3⟩⟨f_3|+\dots ,$

where the $\{{\lambda }_i\}$ are scalars and the $\{|e_i⟩\}$ are a basis and the $\{⟨f_i|\}$ a reciprocal basis for the space. The relation between the basis and the reciprocal basis is described, in part, by:

$⟨f_i|e_j⟩={\delta }_{ij}$

If such a formalism applies, the $\{{\lambda }_i\}$ are eigenvalues of L and the functions $\{|e_i⟩\}$ are eigenfunctions of L. The eigenvalues are in the spectrum of L.

Some natural questions are: under what circumstances does this formalism work, and for what operators L are expansions in series of other operators like this possible? Can any function f be expressed in terms of the eigenfunctions (are they a Schauder basis) and under what circumstances does a point spectrum or a continuous spectrum arise? How do the formalisms for infinite dimensional spaces and finite dimensional spaces differ, or do they differ? Can these ideas be extended to a broader class of spaces? Answering such questions is the realm of spectral theory and requires considerable background in functional analysis and matrix algebra.

Resolution of the identity

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This section continues in the rough and ready manner of the above section using the bra-ket notation, and glossing over the many important details of a rigorous treatment. A rigorous mathematical treatment may be found in various references. In particular, the dimension n of the space will be finite.

Using the bra-ket notation of the above section, the identity operator may be written as:

$I=\sum _{i=1}^n|e_i⟩⟨f_i|$

where it is supposed as above that { $|e_i⟩$ } are a basis and the { $⟨f_i|$ } a reciprocal basis for the space satisfying the relation:

$⟨f_i|e_j⟩={\delta }_{ij}.$

This expression of the identity operation is called a representation or a resolution of the identity.^, This formal representation satisfies the basic property of the identity:

$I^k=I$

valid for every positive integer k.

Applying the resolution of the identity to any function in the space $|\psi ⟩$, one obtains:

$I|\psi ⟩=|\psi ⟩=\sum _{i=1}^n|e_i⟩⟨f_i|\psi ⟩=\sum _{i=1}^n{c}_i|e_i⟩$

which is the generalized Fourier expansion of ψ in terms of the basis functions { e_i }. Here $c_i=⟨f_i|\psi ⟩$.

Given some operator equation of the form:

$O|\psi ⟩=|h⟩$

with h in the space, this equation can be solved in the above basis through the formal manipulations:

$O|\psi ⟩=\sum _{i=1}^n{c}_i\left(O\right|e_i⟩)=\sum _{i=1}^n|e_i⟩⟨f_i|h⟩,$

$⟨f_j\left|O\right|\psi ⟩=\sum _{i=1}^n{c}_i⟨f_j\left|O\right|e_i⟩=\sum _{i=1}^n⟨f_j|e_i⟩⟨f_i|h⟩=⟨f_j|h⟩,\mathrm{\forall }j$

which converts the operator equation to a matrix equation determining the unknown coefficients c_j in terms of the generalized Fourier coefficients $⟨f_j|h⟩$ of h and the matrix elements $O_{ji}=⟨f_j\left|O\right|e_i⟩$ of the operator O.

The role of spectral theory arises in establishing the nature and existence of the basis and the reciprocal basis. In particular, the basis might consist of the eigenfunctions of some linear operator L:

$L|e_i⟩={\lambda }_i|e_i⟩;$

with the { λ_i } the eigenvalues of L from the spectrum of L. Then the resolution of the identity above provides the dyad expansion of L:

$LI=L=\sum _{i=1}^{n}L|e_i⟩⟨f_i|=\sum _{i=1}^n{\lambda }_i|e_i⟩⟨f_i|.$

Resolvent operator

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Singapore has been beckoning to traders ever since the value of properties in Singapore started sky rocketing just a few years again. Many businesses have their places of work in Singapore and prefer to own their own workplace area within the country once they decide to have a everlasting office. Rentals in Singapore in the corporate sector can make sense for some time until a business has discovered a agency footing. Finding Commercial Property Singapore takes a variety of time and effort but might be very rewarding in the long term.

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In 12 months 2013, c ommercial retails, shoebox residences and mass market properties continued to be the celebrities of the property market. Models are snapped up in report time and at document breaking prices. Builders are having fun with overwhelming demand and patrons need more. We feel that these segments of the property market are booming is a repercussion of the property cooling measures no.6 and no. 7. With additional buyer's stamp responsibility imposed on residential properties, buyers change their focus to commercial and industrial properties. I imagine every property purchasers need their property funding to understand in value. Using spectral theory, the resolvent operator R:

$R=(\lambda I-L{)}^{-1},$

can be evaluated in terms of the eigenfunctions and eigenvalues of L, and the Green's function corresponding to L can be found.

Applying R to some arbitrary function in the space, say $\phi$,

$R|\phi ⟩=(\lambda I-L{)}^{-1}|\phi ⟩=\sum _{i=1}^n\frac{1}{\lambda -{\lambda }_i}|e_i⟩⟨f_i|\phi ⟩.$

This function has poles in the complex λ-plane at each eigenvalue of L. Thus, using the calculus of residues:

$\frac{1}{2\pi i}{\oint }_{C}R|\phi ⟩d\lambda =-\sum _{i=1}^n|e_i⟩⟨f_i|\phi ⟩=-|\phi ⟩,$

where the line integral is over a contour C that includes all the eigenvalues of L.

Suppose our functions are defined over some coordinates {x_j}, that is:

$⟨x,\phi ⟩=\phi (x_1,x_2,...).$

Introducing the notation

$⟨x,y⟩=\delta (x-y),$

where δ(x − y) = δ(x₁ − y₁, x₂ − y₂, x₃ − y₃, ...) is the Dirac delta function, we can write

$⟨x,\phi ⟩=\int ⟨x,y⟩⟨y,\phi ⟩dy.$

Then:

$\begin{array}{rl}⟨x,\frac{1}{2\pi i}{\oint }_C\frac{\phi }{\lambda I-L}d\lambda ⟩& =\frac{1}{2\pi i}{\oint }_{C}d\lambda ⟨x,\frac{\phi }{\lambda I-L}⟩\\ & =\frac{1}{2\pi i}{\oint }_{C}d\lambda \int dy⟨x,\frac{y}{\lambda I-L}⟩⟨y,\phi ⟩\end{array}$

The function G(x, y; λ) defined by:

$\begin{array}{rl}G(x,y;\lambda )& =⟨x,\frac{y}{\lambda I-L}⟩\\ & =\sum _{i=1}^n\sum _{j=1}^n⟨x,e_i⟩⟨f_i,\frac{e_j}{\lambda I-L}⟩⟨f_j,y⟩\\ & =\sum _{i=1}^n\frac{⟨x,e_i⟩⟨f_i,y⟩}{\lambda -{\lambda }_i}\\ & =\sum _{i=1}^n\frac{e_i(x)f_i^{*}(y)}{\lambda -{\lambda }_i},\end{array}$

is called the Green's function for operator L, and satisfies:

$\frac{1}{2\pi i}{\oint }_{C}G(x,y;\lambda )d\lambda =-\sum _{i=1}^n⟨x,e_i⟩⟨f_i,y⟩=-⟨x,y⟩=-\delta (x-y).$

Operator equations

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is changing into a rising pattern among Singaporeans as the standard of living is increasing over time and more Singaporeans have abundance of capital to invest on properties. Investing in the personal properties in Singapore I would like to applaud you for arising with such a book which covers the secrets and techniques and tips of among the profitable Singapore property buyers. I believe many novice investors will profit quite a bit from studying and making use of some of the tips shared by the gurus." – Woo Chee Hoe Special bonus for consumers of Secrets of Singapore Property Gurus Actually, I can't consider one other resource on the market that teaches you all the points above about Singapore property at such a low value. Can you? Condominium For Sale (D09) – Yong An Park For Lease

In 12 months 2013, c ommercial retails, shoebox residences and mass market properties continued to be the celebrities of the property market. Models are snapped up in report time and at document breaking prices. Builders are having fun with overwhelming demand and patrons need more. We feel that these segments of the property market are booming is a repercussion of the property cooling measures no.6 and no. 7. With additional buyer's stamp responsibility imposed on residential properties, buyers change their focus to commercial and industrial properties. I imagine every property purchasers need their property funding to understand in value. Consider the operator equation:

$(O-\lambda I)|\psi ⟩=|h⟩;$

in terms of coordinates:

$\int ⟨x,(O-\lambda I)y⟩⟨y,\psi ⟩dy=h(x).$

A particular case is λ = 0.

The Green's function of the previous section is:

$⟨y,G(\lambda )z⟩=⟨y,(O-\lambda I{)}^{-1}z⟩=G(y,z;\lambda ),$

and satisfies:

$\int ⟨x,(O-\lambda I)y⟩⟨y,G(\lambda )z⟩dy=\int ⟨x,(O-\lambda I)y⟩⟨y,(O-\lambda I{)}^{-1}z⟩dy=⟨x,z⟩=\delta (x-z).$

Using this Green's function property:

$\int ⟨x,(O-\lambda I)y⟩G(y,z;\lambda )dy=\delta (x-z).$

Then, multiplying both sides of this equation by h(z) and integrating:

$\int dzh(z)\int dy⟨x,(O-\lambda I)y⟩G(y,z;\lambda )=\int dy⟨x,(O-\lambda I)y⟩\int dzh(z)G(y,z;\lambda )=h(x),$

which suggests the solution is:

$\psi (x)=\int h(z)G(x,z;\lambda )dz.$

That is, the function ψ(x) satisfying the operator equation is found if we can find the spectrum of O, and construct G, for example by using:

$G(x,z;\lambda )=\sum _{i=1}^n\frac{e_i(x)f_i^{*}(z)}{\lambda -{\lambda }_i}.$

There are many other ways to find G, of course. See the articles on Green's functions and on Fredholm integral equations. It must be kept in mind that the above mathematics is purely formal, and a rigorous treatment involves some pretty sophisticated mathematics, including a good background knowledge of functional analysis, Hilbert spaces, distributions and so forth. Consult these articles and the references for more detail.

Spectral theorem and Rayleigh quotient

Optimization problems may be the most useful examples about the combinatorial significance of the eigenvalues and eigenvectors in symmetric matrices, especially for the Rayleigh quotient with respect to a matrix M.

Theorem Let M be a symmetric matrix and let x be the non-zero vector that maximize the Rayleigh quotient with respect to M. Then, x is an eigenvector of M with eigenvalue equal to the Rayleigh quotient. Moreover, this eigenvalue is the largest eigenvalue of M.

Proof Assume the spectral theorem. let the eigenvalues of M are ${\lambda }_1\le {\lambda }_2\le \cdots \le {\lambda }_n$. Since {$v_i$}i is an orthonormal basis, any vector x in this basis is $x=\sum _{i}x{v}_i^T{v}_i$ The way to prove this formula is pretty easy.

$v_j^T\sum _i{v}_i^{T}x{v}_i$

$=\sum _i{v}_i^{T}x{v}_j^T{v}_i$

$=(v_j^{T}x)v_j^T{v}_j$

$=v_j^{T}x$

evaluate the Rayleigh quotient with respect to x:

$\frac{x^{T}Mx}{x^{T}x}$

$=(\sum _i(v_i^{T}x)v_i{)}^{T}M(\sum _j(v_j^{T}x)v_j)$

$=(\sum _i(v_i^{T}x)v_i{)}^T)(\sum _j(v_j^{T}x)v_j{\lambda }_j)$

$=\sum _{i,j}(v_i^{T}x)v_i{)}^T)(v_j^{T}x)v_j{\lambda }_j)$

$=\sum _j(v_j^{T}x)(v_j^{T}x){\lambda }_j$

$=\sum _j(v_j^{T}x{)}^2{\lambda }_j\le {\lambda }_n\sum _j(v_j^{T}x{)}^2$

$={\lambda }_n$

so the Rayleigh quotient is always less than ${\lambda }_n$.

See also

• Spectrum (functional analysis), Resolvent formalism, Decomposition of spectrum (functional analysis)
• Spectral radius, Spectrum of an operator, Spectral theorem
• Self-adjoint operator, Functions of operators, Operator theory
• Sturm–Liouville theory, Integral equations, Fredholm theory
• Compact operators, Isospectral operators, Completeness
• Lax pairs
• Spectral geometry
• Spectral graph theory
• List of functional analysis topics

Notes

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General 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

• 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

• 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

• 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

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• 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

• 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

• 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

• 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

External links

• Evans M. Harrell II: A Short History of Operator Theory
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