Recent content by Nosjack

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    Is x a Group? Testing the 4 Axioms and Multiplication Table Method

    Hey guys, I'm having an issue with a question, namely Let x be a subset of S4. Is x a group? x = {e, (123), (132), (12)(34)} I don't really understand how I can test the 4 axioms of a group and how x being a subset of S4 would help?