3 ideas
3299 | In logic identity involves reflexivity (x=x), symmetry (if x=y, then y=x) and transitivity (if x=y and y=z, then x=z) [Baillie] |
10245 | One geometry cannot be more true than another [Poincaré] |
2685 | The Greek 'philia' covers all good and fruitful relationships [Cooper,JM] |