4 ideas
6408 | Russell needed three extra axioms to reduce maths to logic: infinity, choice and reducibility [Grayling] |
12185 | Logical necessity is epistemic necessity, which is the old notion of a priori [Edgington, by McFetridge] |
6414 | Two propositions might seem self-evident, but contradict one another [Grayling] |
3102 | Why don't we experience or remember going to sleep at night? [Magee] |