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Ideas for 'The Fixation of Belief', 'Structures and Structuralism in Phil of Maths' and 'Principles of Theoretical Logic'

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2 ideas

4. Formal Logic / C. Predicate Calculus PC / 1. Predicate Calculus PC

17750

The first clear proof of the consistency of the first order predicate logic was in 1928 [Hilbert/Ackermann, by Walicki]

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]