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'fragments/reports', 'Could There Be Unicorns?' and 'On the Essence of Truth'
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7 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 / 1. Modal Logic
16951
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It was realised that possible worlds covered all modal logics, if they had a structure [Dummett]
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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / a. Systems of modal logic
16952
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If something is only possible relative to another possibility, the possibility relation is not transitive [Dummett]
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16953
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Relative possibility one way may be impossible coming back, so it isn't symmetrical [Dummett]
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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / d. System T
16960
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If possibilitiy is relative, that might make accessibility non-transitive, and T the correct system [Dummett]
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4. Formal Logic / D. Modal Logic ML / 3. Modal Logic Systems / g. System S4
16958
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In S4 the actual world has a special place [Dummett]
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