5 ideas
6408 | Russell needed three extra axioms to reduce maths to logic: infinity, choice and reducibility [Grayling] |
18925 | If talking donkeys are possible, something exists which could be a talking donkey [Williamson, by Cameron] |
6414 | Two propositions might seem self-evident, but contradict one another [Grayling] |
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] |