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Ideas for 'Set Theory and related topics (2nd ed)', 'Russell's Metaphysical Logic' and 'Seven Quodlibets'

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2 ideas

4. Formal Logic / F. Set Theory ST / 3. Types of Set / e. Equivalence classes

8920	Equivalence relations are reflexive, symmetric and transitive, and classify similar objects [Lipschutz]

4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / p. Axiom of Reducibility

21705

Reducibility says any impredicative function has an appropriate predicative replacement [Linsky,B]