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Ideas for 'Structures and Structuralism in Phil of Maths', 'Some Judgements of Perception' and 'Which Logic is the Right Logic?'

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4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / a. Axioms for sets

10166

ZFC set theory has only 'pure' sets, without 'urelements' [Reck/Price]

4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / j. Axiom of Choice IX

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The axiom of choice now seems acceptable and obvious (if it is meaningful) [Tharp]