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Ideas for 'Structures and Structuralism in Phil of Maths', 'Philippa Foot's Moral Thought' and 'Ontology and Mathematical Truth'

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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

10166

ZFC set theory has only 'pure' sets, without 'urelements' [Reck/Price]