4 ideas
18758 | Validity is provable, but invalidity isn't, because the model is infinite [Church, by McGee] |
18203 | Avoid non-predicative classifications and definitions [Poincaré] |
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] |