Explores the classification of extensions in group theory, emphasizing split extensions and semi-direct products.
Covers the concept of group cohomology, focusing on chain complexes, cochain complexes, cup products, and group rings.
Explores group actions on sets through homomorphisms and Cartesian products, illustrating their properties and equivalent definitions.
Provides a recap of group theory, defining a group as a set with a multiplication operation.
Covers concrete categories with sets and structures, including Ens, Gr, Ab, and Vectk.
