5 ideas
15927 | Definition just needs negation, known variables, conjunction, disjunction, substitution and quantification [Weyl, by Lavine] |
10245 | One geometry cannot be more true than another [Poincaré] |
8386 | Events are picked out by descriptions, and facts by whole sentences [Crane] |
8387 | A cause has its effects in virtue of its properties [Crane] |
8384 | The regularity theory explains a causal event by other items than the two that are involved [Crane] |