Groups and Group Actions: Lecture 9
Theorem of the week 2018-03-12
Summary:
In which we think about homomorphisms, and wonder how many genuinely different groups there are with small orders. Definitions of a homomorphism, isomorphism and automorphism. Proposition 41: Let , be groups, let be a homomorphism. Take , . Then ; ; and . The first followed by considering in two ways. The second followed from . The third […]