Chapter 4: Conjugation, normal subgroups and simple groups | Essence of Group Theory

A VERY important concept of group theory, but often taught without any intuition, so much that it often confuses a lot of people when they first learned it (including me). Conjugation can be visualised easily with a (literal) change of perspective! This video also lays the foundation for quotient groups, which gives rise to some unexpected relationship with number theory.

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