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2 ideas
6023 | Every proposition is either true or false [Chrysippus, by Cicero] |
Full Idea: We hold fast to the position, defended by Chrysippus, that every proposition is either true or false. | |
From: report of Chrysippus (fragments/reports [c.240 BCE]) by M. Tullius Cicero - On Fate ('De fato') 38 | |
A reaction: I am intrigued to know exactly how you defend this claim. It may depend what you mean by a proposition. A badly expressed proposition may have indeterminate truth, quite apart from the vague, the undecidable etc. |
2947 | Questions wouldn't lead anywhere without the law of excluded middle [Russell] |
Full Idea: Without the law of excluded middle, we could not ask the questions that give rise to discoveries. | |
From: Bertrand Russell (An Inquiry into Meaning and Truth [1940], c.p.88) |