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'fragments/reports', 'On the Nature of Moral Values' and 'Letters to Jourdain'
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4 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
6023
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Every proposition is either true or false [Chrysippus, by Cicero]
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5. Theory of Logic / F. Referring in Logic / 1. Naming / a. Names
8447
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In 'Etna is higher than Vesuvius' the whole of Etna, including all the lava, can't be the reference [Frege]
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5. Theory of Logic / F. Referring in Logic / 1. Naming / b. Names as descriptive
8448
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Any object can have many different names, each with a distinct sense [Frege]
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