Ideas from 'The Foundations of Mathematics (2nd ed)' by Kenneth Kunen [2012], by Theme Structure
[found in 'The Foundations of Mathematics' by Kunen,Kenneth [College Publications 2012,9781904987147]].
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8. Modes of Existence / A. Relations / 4. Formal Relations / b. Equivalence relation
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An 'equivalence' relation is one which is reflexive, symmetric and transitive
