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Ideas for 'On the Question of Absolute Undecidability', 'Principia Mathematica' and 'The Boundary Stones of Thought'

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4. Formal Logic / B. Propositional Logic PL / 1. Propositional Logic

18803

Semantics for propositions: 1) validity preserves truth 2) non-contradition 3) bivalence 4) truth tables [Rumfitt]

4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / e. Axioms of PL

9542	The best known axiomatization of PL is Whitehead/Russell, with four axioms and two rules [Russell/Whitehead, by Hughes/Cresswell]