4 ideas
18201 | General principles can be obvious in mathematics, but bold speculations in empirical science [Parsons,C] |
14248 | We could accept the integers as primitive, then use sets to construct the rest [Cohen] |
13304 | Learned men gain more in one day than others do in a lifetime [Posidonius] |
20820 | Time is an interval of motion, or the measure of speed [Posidonius, by Stobaeus] |