Last Updated:2025/11/27

A Poincaré space often serves as an algebraic-topology analogue of a manifold, because its distinguished fundamental class μ induces cap-product isomorphisms between cohomology groups in complementary dimensions.

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A Poincaré space often serves as an algebraic-topology analogue of a manifold, because its distinguished fundamental class μ induces cap-product isomorphisms between cohomology groups in complementary dimensions.

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そのようなn次元位相空間は、n次同調群の特別な元μを持ち、k次コホモロジー群の元とのキャップ積により(n − k)次コホモロジー群への同型を与えるため、代数的位相幾何学で多様体のモデルとしてしばしば用いられる。

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