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nonabelian cohomology : ウィキペディア英語版 | nonabelian cohomology In mathematics, a nonabelian cohomology is any cohomology with coefficients in a nonabelian group, a sheaf of nonabelian groups or even in a topological space. If homology is thought of as the abelianization of homotopy (cf. Hurewicz theorem), then the nonabelian cohomology may be thought of as a dual of homotopy groups. == Nonabelian Poincaré duality ==
See: (Nonabelian Poincare Duality (Lecture 8) )
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