5 ideas
| 7791 | The simplest of the logics based on possible worlds is Lewis's S5 [Lewis,CI, by Girle] |
| 11002 | Equating necessity with informal provability is the S4 conception of necessity [Lewis,CI, by Read] |
| 7458 | The reliability of witnesses depends on whether they benefit from their observations [Laplace, by Hacking] |
| 21507 | Scientific explanation aims at a unifying account of underlying structures and processes [Hempel] |
| 3441 | If a supreme intellect knew all atoms and movements, it could know all of the past and the future [Laplace] |