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Whale come back. Today we'll prove that a certain algebraic structure with a certain operation on the reals is a group + a little bonus exercise :) Enjoy! =D
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0:00 Intro
0:58 The Exercise
1:45 A Spicy Proof by Contradiction
7:50 Group Axioms
8:56 Associativity
12:15 Identity
14:30 Inverse Elements
17:40 Bonus Exercise