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Ideas for
'fragments/reports', 'Reply to Professor Marcus' and 'On Mental Entities'
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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
10801
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Either reference really matters, or we don't need to replace it with substitutions [Quine]
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