4 ideas
18465 | An 'equivalence' relation is one which is reflexive, symmetric and transitive [Kunen] |
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] |
16689 | The schools said spirits lack extension, and wonder how many could dance on a needle's point [More,H] |