History of Equivalence relation

	Revision 18 . . October 18, 2001 9:05 pm by AxelBoldt [generating equivalence relations]
	Revision 17 . . October 10, 2001 7:01 pm by AxelBoldt [Cosets as equivalence classes]
	Revision 15 . . October 9, 2001 9:43 pm by Sjn28 [More examples, and all 3 conditions are necessary]

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