4 ideas
18946 | Unreflectively, we all assume there are nonexistents, and we can refer to them [Reimer] |
6408 | Russell needed three extra axioms to reduce maths to logic: infinity, choice and reducibility [Grayling] |
6414 | Two propositions might seem self-evident, but contradict one another [Grayling] |
19436 | Bare or primary matter is passive; it is clothed or secondary matter which contains action [Leibniz] |