Combining Philosophers
Ideas for H.Putnam/P.Oppenheim, Hilbert,D/Ackermann,W and John Stuart Mill
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4. Formal Logic / C. Predicate Calculus PC / 1. Predicate Calculus PC
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The first clear proof of the consistency of the first order predicate logic was in 1928 [Hilbert/Ackermann, by Walicki]
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4. Formal Logic / F. Set Theory ST / 7. Natural Sets
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What physical facts could underlie 0 or 1, or very large numbers? [Frege on Mill]
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