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Poincaré residue : ウィキペディア英語版
Poincaré residue
In mathematics, the Poincaré residue is a generalization, to several complex variables and complex manifold theory, of the residue at a pole of complex function theory. It is just one of a number of such possible extensions.
The theory assumes given a meromorphic complex form ω of degree ''n'' on C''n'' (or ''n''-dimensional complex manifold, but the definition is local). Along a hypersurface ''H'' defined by
:''f'' = 0
there is the meromorphic 1-form
:''df''/''f''.
The Poincaré residue ρ along ''H'' is by definition a holomorphic (''n'' − 1)-form on the hypersurface, for which there is an extension ρ′, locally to C''n'', such that ω is the wedge product of ''df''/''f'' with ρ′. While ρ′ is not necessary unique, as a holomorphic extension of ρ, it is the case that ρ is uniquely defined.
==See also==

* Grothendieck residue
* Leray residue

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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