display all the ideas for this combination of texts
4 ideas
21495 | Theoretical and practical politics are both concerned with the best lives for individuals [Russell] |
8078 | Modus ponens is one of five inference rules identified by the Stoics [Chrysippus, by Devlin] |
6023 | Every proposition is either true or false [Chrysippus, by Cicero] |
10800 | The values of variables can't determine existence, because they are just expressions [Ryle, by Quine] |