display all the ideas for this combination of texts
4 ideas
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] |
10884 | A theory is 'categorical' if it has just one model up to isomorphism [Horsten] |
4810 | Valid deduction is monotonic - that is, it remains valid if further premises are added [Psillos] |