New posts in Homology Cohomology

Can a non-compact manifold have infinite-dimensional cohomology?

Turning cobordism into a cohomology theory

Relative homology groups of the torus

What tells rational cohomology about integral cohomology?

Intuition of the meaning of homology groups

No torsion in $H^1_c(X,\mathbf{Z})$?

Direct proof that the wedge product preserves integral cohomology classes?

Homology of the Empty set

Poincare Duality Reference

Motivating Cohomology