4 ideas
10053 | Geometrical axioms imply the propositions, but the former may not be true [Russell] |
10052 | Geometry is united by the intuitive axioms of projective geometry [Russell, by Musgrave] |
16654 | Our words and concepts don't always correspond to what is out there [William of Ockham] |
3102 | Why don't we experience or remember going to sleep at night? [Magee] |