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Ideas for 'fragments/reports', 'Thinking About Logic' and 'Principia Mathematica'

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4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / c. Derivation rules of PL

10987

Three traditional names of rules are 'Simplification', 'Addition' and 'Disjunctive Syllogism' [Read]

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]