3 ideas
| 15716 | If axioms and their implications have no contradictions, they pass my criterion of truth and existence [Hilbert] |
| 21650 | No language is semantically referential; it all occurs at the level of thought or utterance [Pietroski, by Hofweber] |
| 14014 | Space alone, and time alone, will fade away, and only their union has an independent reality [Minkowski] |