If manifold is closed oriented, we have Poincare duality to relate homology and cohomology groups of manifold. My question is that what is the Relation between twisted and untwisted rational homology and cohomology of non oriented manifold(closed or open).
2026-02-23 06:38:44.1771828724
Relation between twisted and untwisted rational cohomology of non oriented manifold.
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