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Ideas for 'Essays on Intellectual Powers: Conception', 'The Philosophy of Mathematics' and 'Which Logic is the Right Logic?'

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3 ideas

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

9193	ZF set theory has variables which range over sets, 'equals' and 'member', and extensionality [Dummett]

9194	The main alternative to ZF is one which includes looser classes as well as sets [Dummett]

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

10775

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