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2 ideas
| 22154 | For Aristotle bivalence is a feature of reality [Aristotle, by Boulter] |
| Full Idea: For Aristotle the principle of bivalence is primarily a principle of metaphysics, not logic. It applies to entities in the real order first, and to propositions in the rational order second. | |
| From: report of Aristotle (Metaphysics [c.324 BCE]) by Stephen Boulter - Why Medieval Philosophy Matters 5 | |
| A reaction: This is because nothing is vague. Boulter says this is also the case with non-contradiction. I like this idea very much. I reject the Fregean picture of the autonomy of the rational order. Logic is powerful because it reflects reality. |
| 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. |