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 2012,978-1-904987-14-7]].

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8. Modes of Existence / A. Relations / 4. Formal Relations / b. Equivalence relation
An 'equivalence' relation is one which is reflexive, symmetric and transitive