Combining Philosophers

Ideas for Douglas Lackey, Saunders MacLane and Michael Jubien

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2 ideas

4. Formal Logic / F. Set Theory ST / 1. Set Theory

9967	'Impure' sets have a concrete member, while 'pure' (abstract) sets do not [Jubien]

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

18189

ZFC could contain a contradiction, and it can never prove its own consistency [MacLane]