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'fragments/reports', 'Necessity and Non-Existence' and 'Frege's Concept of Numbers as Objects'
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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
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 / d. Singular terms
9868
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An expression refers if it is a singular term in some true sentences [Wright,C, by Dummett]
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