Combining Texts

Ideas for 'fragments/reports', 'The Structure of Empirical Knowledge' and 'Philosophy and the Nature of Language'

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3 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 / 2. Descriptions / c. Theory of definite descriptions

4568	If 'Queen of England' does not refer if there is no queen, its meaning can't refer if there is one [Cooper,DE]