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complex analytic space : ウィキペディア英語版
complex analytic space
In mathematics, a complex analytic space is a generalization of a complex manifold which allows the presence of singularities. Complex analytic spaces are locally ringed spaces which are locally isomorphic to local model spaces, where a local model space is an open subset of the vanishing locus of a finite set of holomorphic functions.
==Definition==
Denote the constant sheaf on a topological space with value \mathbb by \underline-space is a locally ringed space (X, \mathcal_X) whose structure sheaf is an algebra over \underline^n, and fix finitely many holomorphic functions f_1,\dots,f_k in U. Let X=V(f_1,\dots,f_k) be the common vanishing locus of these holomorphic functions, that is, X=\. Define a sheaf of rings on X by letting \mathcal_X be the restriction to X of \mathcal_U/(f_1, \ldots, f_k), where \mathcal_U is the sheaf of holomorphic functions on U. Then the locally ringed \mathbb-space (X, \mathcal_X) is a local model space.
A complex analytic space is a locally ringed \mathbb-space (X, \mathcal_X) which is locally isomorphic to a local model space.
Morphisms of complex analytic spaces are defined to be morphisms of the underlying locally ringed spaces, they are also called holomorphic maps.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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