Combining Texts

Ideas for 'fragments/reports', 'Reference and Modality' and 'De Essentia'

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4 ideas

5. Theory of Logic / B. Logical Consequence / 5. Modus Ponens

8078	Modus ponens is one of five inference rules identified by the Stoics [Chrysippus, by Devlin]

5. Theory of Logic / D. Assumptions for Logic / 2. Excluded Middle

6023	Every proposition is either true or false [Chrysippus, by Cicero]

5. Theory of Logic / F. Referring in Logic / 1. Naming / b. Names as descriptive

10925

Failure of substitutivity shows that a personal name is not purely referential [Quine]

5. Theory of Logic / G. Quantification / 1. Quantification

10926

Quantifying into referentially opaque contexts often produces nonsense [Quine]