6 ideas
| 21558 | 'Predicative' norms are those which define a class [Russell] |
| 21559 | We need rules for deciding which norms are predicative (unless none of them are) [Russell] |
| 22363 | You have only begun to do real science when you can express it in numbers [Kelvin] |
| 13304 | Learned men gain more in one day than others do in a lifetime [Posidonius] |
| 20644 | Energy has progressed from a mere formula, to a principle pervading all nature [Kelvin] |
| 20820 | Time is an interval of motion, or the measure of speed [Posidonius, by Stobaeus] |