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Groups

Suppose we have three chips and we let two of them be indistinguishable and we shuffle them. We get S3 acting on the 3 possible states in 6 different ways. But if all three chips are the same, then we get just the identity.

Nathan Carter "Visual Group Theory"

• https://www.youtube.com/playlist?list=PLwV-9DG53NDxU337smpTwm6sef4x-SCLv

Introduction to Commutative Algebra Atiyah & Macdonald. Rings, ideals, modules, dimensions

• Abstract algebra. Dummit and Foote.

{$\textrm{Set}^{op}$} atomic boolean algebras. Map back into Set. Map back out PowerSet.