Abstract Algebra: Groups (definition, first examples)

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Intro (0:00)
Binary operations (0:10)
Associativity and commutativity (5:56)
Groups (definition) (13:43)
Examples and non-examples of groups (16:48)

*Correction: In the picture at 13:00, symmetric difference of 3 sets, the middle triangular region should also be filled in.*

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