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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
18465 An 'equivalence' relation is one which is reflexive, symmetric and transitive
                        Full Idea: R is an equivalence relation on A iff R is reflexive, symmetric and transitive on A.
                        From: Kenneth Kunen (The Foundations of Mathematics (2nd ed) [2012], I.7.1)