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'fragments/reports', 'Reply to Professor Marcus' and 'Truthmakers and Converse Barcan Formula'
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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 / 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 / h. System S5
15131
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If metaphysical possibility is not a contingent matter, then S5 seems to suit it best [Williamson]
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4. Formal Logic / D. Modal Logic ML / 7. Barcan Formula
15135
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If the domain of propositional quantification is constant, the Barcan formulas hold [Williamson]
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15139
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Converse Barcan: could something fail to meet a condition, if everything meets that condition? [Williamson]
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