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'Reportatio', 'Elements of Geometry' and 'Completeness of Axioms of Logic'
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4. Formal Logic / C. Predicate Calculus PC / 2. Tools of Predicate Calculus / c. Derivations rules of PC
13907
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If you pick an arbitrary triangle, things proved of it are true of all triangles [Euclid, by Lemmon]
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4. Formal Logic / C. Predicate Calculus PC / 3. Completeness of PC
17751
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Gödel proved the completeness of first order predicate logic in 1930 [Gödel, by Walicki]
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