4 ideas
| 291 | Don't assume that wisdom is the automatic consequence of old age [Plato] |
| 15927 | Definition just needs negation, known variables, conjunction, disjunction, substitution and quantification [Weyl, by Lavine] |
| 9159 | You can't simply convert geometry into algebra, as some spatial content is lost [Burge] |
| 293 | Being unafraid (perhaps through ignorance) and being brave are two different things [Plato] |