4 ideas
10245 | One geometry cannot be more true than another [Poincaré] |
9379 | A sentence is obvious if it is true, and any speaker of the language will instantly agree to it [Quine] |
13165 | Geometrical proofs do not show causes, as when we prove a triangle contains two right angles [Proclus] |
9569 | The origin of geometry started in sensation, then moved to calculation, and then to reason [Proclus] |