11 ideas
| 3035 | Dialectic involves conversations with short questions and brief answers [Diog. Laertius] |
| 20660 | At one level maths and nature are very similar, suggesting some deeper origin [Wolfram] |
| 594 | Speusippus suggested underlying principles for every substance, and ended with a huge list [Speussipus, by Aristotle] |
| 1816 | Sceptics say demonstration depends on self-demonstrating things, or indemonstrable things [Diog. Laertius] |
| 1819 | Scepticism has two dogmas: that nothing is definable, and every argument has an opposite argument [Diog. Laertius] |
| 3064 | When sceptics say that nothing is definable, or all arguments have an opposite, they are being dogmatic [Diog. Laertius] |
| 3033 | Induction moves from some truths to similar ones, by contraries or consequents [Diog. Laertius] |
| 1838 | Cyrenaic pleasure is a motion, but Epicurean pleasure is a condition [Diog. Laertius] |
| 1769 | Cynics believe that when a man wishes for nothing he is like the gods [Diog. Laertius] |
| 20659 | Space and its contents seem to be one stuff - so space is the only existing thing [Wolfram] |
| 2632 | Speusippus said things were governed by some animal force rather than the gods [Speussipus, by Cicero] |