5 ideas
10053 | Geometrical axioms imply the propositions, but the former may not be true [Russell] |
10801 | Either reference really matters, or we don't need to replace it with substitutions [Quine] |
10052 | Geometry is united by the intuitive axioms of projective geometry [Russell, by Musgrave] |
2614 | Modern phenomenalism holds that objects are logical constructions out of sense-data [Ayer] |
2615 | The concept of sense-data allows us to discuss appearances without worrying about reality [Ayer] |