Combining Philosophers
Ideas for Jos�� Ortega y Gassett, Ian Rumfitt and Paul J. Cohen
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4. Formal Logic / B. Propositional Logic PL / 1. Propositional Logic
18803
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Semantics for propositions: 1) validity preserves truth 2) non-contradition 3) bivalence 4) truth tables [Rumfitt]
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