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Ideas for 'fragments/reports', 'Substance' and 'Structures and Structuralism in Phil of Maths'

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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 / G. Quantification / 5. Second-Order Quantification

10175

Three types of variable in second-order logic, for objects, functions, and predicates/sets [Reck/Price]