display all the ideas for this combination of texts
4 ideas
8951 | Classical logic is: excluded middle, non-contradiction, contradictions imply all, disjunctive syllogism [Fisher] |
8078 | Modus ponens is one of five inference rules identified by the Stoics [Chrysippus, by Devlin] |
8950 | Logic formalizes how we should reason, but it shouldn't determine whether we are realists [Fisher] |
6023 | Every proposition is either true or false [Chrysippus, by Cicero] |