Combining Philosophers
Ideas for Douglas Lackey, Saunders MacLane and Michael Jubien
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4. Formal Logic / F. Set Theory ST / 1. Set Theory
9967
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'Impure' sets have a concrete member, while 'pure' (abstract) sets do not [Jubien]
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4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / a. Axioms for sets
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ZFC could contain a contradiction, and it can never prove its own consistency [MacLane]
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