Local Rings and ResiduesCovers the proof of theorem 4.2 on multiplicities and the special structure of local rings at a simple point of a plane.
Homotopical AlgebraCovers the theory of groups and homotopical algebra, emphasizing natural transformations, identities, and isomorphism of categories.
Isomorphism of GroupsCovers bijections between automorphisms and equivariant bijections in group isomorphisms.