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{{Functions}}
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The theory of [[function (mathematics)|function]]s of '''several complex variables''' is the branch of [[mathematics]] dealing with [[complex number|complex valued]] functions
 
:<math>f(z_1,z_2, \ldots, z_n)</math>
 
on the [[#The Cn space|space {{math|'''C'''<sup>''n''</sup>}} of {{mvar|n}}-tuples]] of complex numbers. As in [[complex analysis]], which is the case {{math|1=''n'' = 1}} but of a distinct character, these are not just any functions: they are supposed to be '''[[holomorphic function|holomorphic]]''' or '''complex analytic''', so that locally speaking they are [[power series]] in the variables {{mvar|z<sub>i</sub>}}.
 
Equivalently, as it turns out, they are locally [[uniform convergence|uniform limits]] of [[polynomial]]s; or locally [[Lp space|square-integrable]]{{citation needed|date=July 2013|reason=It is plausible, but the fact that any L² solution is differentiable in the sense of mathematical analysis needs a citation}} solutions to the {{mvar|n}}-dimensional [[Cauchy–Riemann equations]].
 
== Historical perspective ==
 
Many examples of such functions were familiar in nineteenth-century mathematics: [[abelian variety|abelian functions]], [[theta function]]s, and some [[hypergeometric series]]. Naturally also any function of one variable that depends on some complex [[parameter]] is a candidate. The theory, however, for many years didn't become a full-fledged area in [[mathematical analysis]], since its characteristic phenomena weren't uncovered. The [[Weierstrass preparation theorem]] would now be classed as [[commutative algebra]]; it did justify the local picture, [[ramification]], that addresses the generalisation of the [[branch point]]s of [[Riemann surface]] theory.
 
With work of [[Friedrich Hartogs]], and of [[Kiyoshi Oka]] in the 1930s, a general theory began to emerge; others working in the area at the time were [[Heinrich Behnke]], [[Peter Thullen]] and [[Karl Stein (mathematician)|Karl Stein]]Hartogs proved some basic results, such as every [[isolated singularity]] is [[removable singularity|removable]], for any analytic function
:<math>f:\mathbf{C}^n\longrightarrow\mathbf{C}</math>
whenever {{math|1=''n'' > 1}}. Naturally the analogues of [[Line integral|contour integrals]] will be harder to handle: when {{math|1=''n'' = 2}} an integral surrounding a point should be over a three-dimensional [[manifold]] (since we are in four real dimensions), while iterating contour (line) integrals over two separate complex variables should come to a [[double integral]] over a two-dimensional surface. This means that the [[residue calculus]] will have to take a very different character.
 
After 1945 important work in France, in the seminar of [[Henri Cartan]], and Germany with [[Hans Grauert]] and [[Reinhold Remmert]], quickly changed the picture of the theory. A number of issues were clarified, in particular that of [[analytic continuation]]. Here a major difference is evident from the one-variable theory: while for any open connected set {{mvar|D}} in {{math|'''C'''}} we can find a function that will nowhere continue analytically over the boundary, that cannot be said for {{math|''n'' > 1}}. In fact the {{mvar|D}} of that kind are rather special in nature (a condition called ''[[pseudoconvexity]]''). The natural domains of definition of functions, continued to the limit, are called ''[[Stein manifold]]s'' and their nature was to make [[sheaf cohomology]] groups vanish. In fact it was the need to put (in particular) the work of Oka on a clearer basis that led quickly to the consistent use of sheaves for the formulation of the theory (with major repercussions for [[algebraic geometry]], in particular from Grauert's work).
 
From this point onwards there was a foundational theory, which could be applied to ''analytic geometry'' (a name adopted, confusingly, for the geometry of zeroes of analytic functions: this is not the [[analytic geometry]] learned at school), [[automorphic form]]s of several variables, and [[partial differential equation]]s. The [[complex structure deformation|deformation theory of complex structures]] and [[complex manifold]]s was described in general terms by [[Kunihiko Kodaira]] and [[D.C. Spencer]]. The celebrated paper ''[[GAGA]]'' of [[Jean-Pierre Serre|Serre]] pinned down the crossover point from ''géometrie analytique'' to ''géometrie algébrique''.
 
[[C.L. Siegel]] was heard to complain that the new ''theory of functions of several complex variables'' had few ''functions'' in it, meaning that the [[special function]] side of the theory was subordinated to sheaves. The interest for [[number theory]], certainly, is in specific generalisations of [[modular form]]s. The classical candidates are the [[Hilbert modular form]]s and [[Siegel modular form]]s. These days these are associated to [[algebraic group]]s (respectively the [[Weil restriction]] from a [[totally real number field]] of {{math|[[general linear group|GL]](2)}}, and the [[symplectic group]]), for which it happens that [[automorphic representation]]s can be derived from analytic functions. In a sense this doesn't contradict Siegel; the modern theory has its own, different directions.
 
Subsequent developments included the [[hyperfunction]] theory, and the [[edge-of-the-wedge theorem]], both of which had some inspiration from [[quantum field theory]]. There are a number of other fields, such as [[Banach algebra]] theory, that draw on several complex variables.
 
== The '''C'''<sup>''n''</sup> space ==
The simplest Stein manifold is the space {{math|'''C'''<sup>''n''</sup>}} (the [[complex number|complex]] {{mvar|n}}-space), which consists of {{mvar|n}}-[[tuple]]s of complex numbers. It can be considered as {{mvar|n}}-[[dimension (mathematics)|dimensional]] [[vector space]] over [[complex number]]s, which gives its dimension {{math|2''n''}} over [[real number|{{math|'''R'''}}]].<ref>The field of complex numbers is a 2-dimensional vector space over real numbers.</ref> Hence, as a set, and as [[topological space]], {{math|'''C'''<sup>''n''</sup>}} is identical to [[real coordinate space|{{math|'''R'''<sup>2''n''</sup>}}]]<!-- explain the x1/y1/x2/y2 order of the standard basis --> and its [[topological dimension]] is {{math|2''n''}}.
 
In coordinate-free language, any vector space over complex numbers may be thought of as a real vector space of twice dimensions, where [[almost complex manifold|a complex structure]] is specified with a [[linear operator]] {{mvar|J}} (such that {{math|1=''J''<sup> 2</sup> = [[reflection through the origin|−''I'']]}}) which defines the [[scalar multiplication|multiplication]] to the [[imaginary unit]] {{math|''i''}}.
 
Any such space, as a real space, is [[orientation (vector space)|oriented]]. On the [[complex plane]] thought of as the [[Cartesian plane]], [[multiplication]] to a complex number {{math|1=''w'' = ''u'' + ''iv''}} has the real [[matrix (mathematics)|matrix]]
:<math>\begin{pmatrix}
u &&-v \\
v && u
\end{pmatrix},</math>
 
a [[2&#8239;×&#8239;2 real matrix]] that has the [[determinant]]
 
:<math>u^2 + v^2 = |w|^2\,.</math>
 
Likewise, if one expresses any finite-dimensional complex linear operator as a real matrix (which will be [[block matrix|composed from 2&#8239;×&#8239;2 blocks]] of the aforementioned form), then its determinant equals to the [[square (algebra)#In complex analysis|square of absolute value]] of the corresponding complex determinant. It is a non-negative number, which implies that [[real coordinate space#Orientation|the (real) orientation of the space is never reversed]] by a complex operator. The same applies to [[Jacobian matrix and determinant|Jacobians]] of [[holomorphic function]]s from {{math|'''C'''<sup>''n''</sup>}} to {{math|'''C'''<sup>''n''</sup>}}.
{{expand section|date=April 2013}}
 
==See also==
 
*[[Coherent sheaf]]
*[[Cartan's theorems A and B]]
*[[Cousin problems]]
*[[Hartogs' lemma]]
*[[Hartogs' theorem]]
*[[Biholomorphy]]
*[[Domain of holomorphy]]
*[[Complex geometry]]
*[[Complex projective space]]
 
==Footnotes==
{{reflist}}
 
==References==
 
*H. Behnke and P. Thullen, ''Theorie der Funktionen mehrerer komplexer Veränderlichen'' (1934)
*[[Salomon Bochner]] and W. T. Martin ''Several Complex Variables'' (1948)
*[[Lars Hörmander]], ''An Introduction to Complex Analysis in Several Variables'' (1966) and later editions
*Steven G. Krantz, ''Function Theory of Several Complex Variables'' (1992)
*Volker Scheidemann, ''Introduction to complex analysis in several variables'', Birkhäuser, 2005, ISBN 3-7643-7490-X
 
[[Category:Several complex variables| ]]

Latest revision as of 14:18, 5 December 2014

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