September 16, hour 3 - Non Commutative Gaussian Elimination, Homomorphisms, Kernels and Images
September-15-10
6:53 PM
Finish tracing the NCGE handout; along do the S_4 example.
Go over the "about" handout.
Group homomorphisms, the "category" of groups, images and kernels. Example: S_3 is an image of S_4, but not a kernel.
Normal subgroups, kernels are normal.
Question: Is there a normal subgroup of S_4 which is isomorphic to S_3?