7 ideas
| 8463 | Maths can be reduced to logic and set theory [Quine] |
| 12741 | If experience is just a dream, it is still real enough if critical reason is never deceived [Leibniz] |
| 12740 | The strongest criterion that phenomena show reality is success in prediction [Leibniz] |
| 8461 | The category of objects incorporates the old distinction of substances and their modes [Quine] |
| 12721 | Light, heat and colour are apparent qualities, and so are motion, figure and extension [Leibniz] |
| 1556 | By nature people are close to one another, but culture drives them apart [Hippias] |
| 8462 | A hallucination can, like an ague, be identified with its host; the ontology is physical, the idiom mental [Quine] |