Combining Texts

Ideas for 'fragments/reports', 'Modal Logics and Philosophy' and 'Evidentialism'

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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 / B. Logical Consequence / 7. Strict Implication

7789	Necessary implication is called 'strict implication'; if successful, it is called 'entailment' [Girle]

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 / H. Proof Systems / 5. Tableau Proof

7790	If an argument is invalid, a truth tree will indicate a counter-example [Girle]