6 ideas
17831 | Cantor gives informal versions of ZF axioms as ways of getting from one set to another [Cantor, by Lake] |
22593 | Our sensation of light may not be the same as what produces the sensation [Descartes] |
13304 | Learned men gain more in one day than others do in a lifetime [Posidonius] |
16569 | The Hot, Cold, Wet and Dry of the philosophers need themselves to be explained [Descartes] |
20964 | Descartes said there was conservation of 'quantity of motion' [Descartes, by Papineau] |
20820 | Time is an interval of motion, or the measure of speed [Posidonius, by Stobaeus] |