For questions involving or related to Poincaré duality.
Poincaré duality is an important result in homology theory, which relates homology and cohomology groups via an isomorphism.
It states that, under appropriate assumptions on a manifold $M$, $$H_{n-k}(M)\cong H^k(M)$$
Consider using this tag along with homology-cohomology or one of the associated cohomology tags.
