4 ideas
9117 | The smallest heap has four objects: three on the bottom, one on the top [Hart,WD, by Sorensen] |
10190 | From the axiomatic point of view, mathematics is a storehouse of abstract structures [Bourbaki] |
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] |