Concept

Quasi-isomorphism

Related lectures (5)

Covers the concept of group cohomology, focusing on chain complexes, cochain complexes, cup products, and group rings.

Focuses on lifting properties in homotopy theory of chain complexes.

Explores the homotopy theory of chain complexes, focusing on model categories, weak equivalences, and the retraction axiom.

Explores the homotopy category of chain complexes and the relation between quasi-isomorphisms and chain homotopy equivalences.

Covers the cup product on cohomology, acyclic models, and the universal coefficient theorem.