Combining Texts

Ideas for 'fragments/reports', 'Modality' and 'Primitive Thisness and Primitive Identity'

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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 / G. Quantification / 5. Second-Order Quantification

5740	Second-order logic needs second-order variables and quantification into predicate position [Melia]

5. Theory of Logic / J. Model Theory in Logic / 1. Logical Models

5741	If every model that makes premises true also makes conclusion true, the argument is valid [Melia]