5 ideas
| 291 | Don't assume that wisdom is the automatic consequence of old age [Plato] |
| 13007 | Archimedes defined a straight line as the shortest distance between two points [Archimedes, by Leibniz] |
| 18883 | Any equivalence relation among similar things allows the creation of an abstractum [Simons] |
| 18884 | Abstraction is usually seen as producing universals and numbers, but it can do more [Simons] |
| 293 | Being unafraid (perhaps through ignorance) and being brave are two different things [Plato] |