Combining Philosophers
Ideas for Saunders MacLane, Sextus Empiricus and Jan Lukasiewicz
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2 ideas
4. Formal Logic / E. Nonclassical Logics / 3. Many-Valued Logic
8942
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Lukasiewicz's L3 logic has three truth-values, T, F and I (for 'indeterminate') [Lukasiewicz, by Fisher]
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4. Formal Logic / F. Set Theory ST / 4. Axioms for Sets / a. Axioms for sets
18189
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ZFC could contain a contradiction, and it can never prove its own consistency [MacLane]
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