Ideas from 'Set Theory and related topics (2nd ed)' by Seymour Lipschutz , by Theme Structure
[found in 'Set Theory and related topics (2nd ed)' by Lipschutz,Seymour [McGraw-Hill 1998,0-07-038159-3]].
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4. Formal Logic / F. Set Theory ST / 3. Types of Set / e. Equivalence classes
Equivalence relations are reflexive, symmetric and transitive, and classify similar objects