Combining Texts
Ideas for
'Philosophy of Nature (Encylopedia II)', 'Two Concepts of Liberty' and 'The Philosophy of Mathematics'
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2 ideas
4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / a. Axioms for sets
9193
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ZF set theory has variables which range over sets, 'equals' and 'member', and extensionality [Dummett]
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The main alternative to ZF is one which includes looser classes as well as sets [Dummett]
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