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'fragments/reports', 'Dialogues Concerning Natural Religion' and 'A Problem about Substitutional Quantification?'
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3 ideas
5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens
8078
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Modus ponens is one of five inference rules identified by the Stoics [Chrysippus, by Devlin]
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5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle
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Every proposition is either true or false [Chrysippus, by Cicero]
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5. Theory of Logic / G. Quantification / 4. Substitutional Quantification
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The substitutional quantifier is not in competition with the standard interpretation [Kripke, by Marcus (Barcan)]
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