A graded object in abelian groups.

A generalized homology/generalized cohomology theory is a suitable covariant functor/contravariant functor from suitable topological spaces to $\mathbb{Z}$-graded abelian groups (“cohomology groups”).

Last revised on May 10, 2022 at 22:24:12. See the history of this page for a list of all contributions to it.