Date and Time: Saturday 24 October, 11.30am
Speaker: Deep Makadiya
Google Meet Link:
https://meet.google.com/afe-nzqz-sgt
Title: Schreier’s theorem
Abstract: For any group G, Schreier theorem states that any two subnormal series of G have isomorphic refinements. This is one of the fundamental results in group theory. The proof involves another interesting lemma called Butterfly Lemma (also known as Zassenhaus Lemma). As a consequence of Schreier's theorem, we shall also outline a proof of Jordan-Hölder theorem for composition series.