4 ideas
9355 | One sort of circularity presupposes a premise, the other presupposes a rule being used [Braithwaite, by Devitt] |
10053 | Geometrical axioms imply the propositions, but the former may not be true [Russell] |
10245 | One geometry cannot be more true than another [Poincaré] |
10052 | Geometry is united by the intuitive axioms of projective geometry [Russell, by Musgrave] |