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Ideas for 'Set Theory and related topics (2nd ed)', 'On Interpretation' and 'My Philosophical Development'

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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 / 8. Critique of Set Theory

6436	I gradually replaced classes with properties, and they ended as a symbolic convenience [Russell]