4 ideas
9548 | A mathematical object exists if there is no contradiction in its definition [Waterfield] |
604 | Knowledge is mind and knowing 'cohabiting' [Lycophron, by Aristotle] |
20645 | Heat is a state of vibration, not a substance [Joule] |
20972 | Joule showed that energy converts to heat, and heat to energy [Joule, by Papineau] |