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'fragments/reports', 'Essays on Intellectual Powers 5: Abstraction' and 'An Introduction to Modal Logic'
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5 ideas
4. Formal Logic / B. Propositional Logic PL / 1. Propositional Logic
8077
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Stoic propositional logic is like chemistry - how atoms make molecules, not the innards of atoms [Chrysippus, by Devlin]
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4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / b. Terminology of PL
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A 'value-assignment' (V) is when to each variable in the set V assigns either the value 1 or the value 0 [Hughes/Cresswell]
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4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / d. Basic theorems of PL
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The Law of Transposition says (P→Q) → (¬Q→¬P) [Hughes/Cresswell]
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4. Formal Logic / B. Propositional Logic PL / 2. Tools of Propositional Logic / e. Axioms of PL
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Chrysippus has five obvious 'indemonstrables' of reasoning [Chrysippus, by Diog. Laertius]
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4. Formal Logic / B. Propositional Logic PL / 4. Soundness of PL
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The rules preserve validity from the axioms, so no thesis negates any other thesis [Hughes/Cresswell]
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