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'fragments/reports', 'On Virtue Ethics' and 'A Theory of Universals'
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3 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 / e. Axioms of PL
20791
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Chrysippus has five obvious 'indemonstrables' of reasoning [Chrysippus, by Diog. Laertius]
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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / g. System S4
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If what is actual might have been impossible, we need S4 modal logic [Armstrong, by Lewis]
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