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Ideas for 'Necessary Existents', 'Three-Dimensionalism v Four-Dimensionalism' and 'Principles of Theoretical Logic'

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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]