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'The Courtier and the Heretic', 'Frege' and 'Elements of Geometry'
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4. Formal Logic / B. Propositional Logic PL / 1. Propositional Logic
7726
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Aristotelian logic dealt with inferences about concepts, and there were also proposition inferences [Weiner]
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4. Formal Logic / C. Predicate Calculus PC / 2. Tools of Predicate Calculus / c. Derivations rules of PC
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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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