Combining Texts
Ideas for
'fragments/reports', 'Analyzing Modality' and 'Criterion of Validity in Reasoning'
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4 ideas
5. Theory of Logic / A. Overview of Logic / 3. Value of Logic
14780
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Only study logic if you think your own reasoning is deficient [Peirce]
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5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens
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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 / 3. Objectual Quantification
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'All horses' either picks out the horses, or the things which are horses [Jubien]
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