4 ideas
13166 | Essences are no use in mathematics, if all mathematical truths are necessary [Mancosu] |
3016 | Even the gods cannot strive against necessity [Pittacus, by Diog. Laertius] |
13165 | Geometrical proofs do not show causes, as when we prove a triangle contains two right angles [Proclus] |
9569 | The origin of geometry started in sensation, then moved to calculation, and then to reason [Proclus] |