Homology and cohomology groups, on the other hand, are abelian and in many important cases finitely generated. Finitely generated abelian groups are completely classified and are particularly easy to work with.
Homology and cohomology groups, on the other hand are abelian and in many important .cases finitely generated. Finitely generated abelian groups a?re completely classified and are particul,arly easy to work with.