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Ideas for 'In Defense of Essentialism', 'Syntactic Structure' and 'The Philosophy of Mathematics'

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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]