Groups and Group Actions: Lecture 10
Theorem of the week 2018-03-12
Summary:
In which we think some more about homomorphisms, and meet normal subgroups. Proposition 45: Let be a homomorphism. Then there is with for all . We proved this by defining and then using the fact that generates . Proposition 46: Let , be groups, let be a homomorphism. Then is a subgroup of ; and is a […]