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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
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