4 ideas
10053 | Geometrical axioms imply the propositions, but the former may not be true [Russell] |
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] |
10052 | Geometry is united by the intuitive axioms of projective geometry [Russell, by Musgrave] |
1590 | The just man does not harm his enemies, but benefits everyone [Plato] |