4 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] |
2713 | Are sense-data independent, with identity, substance and location? [Tye] |
22511 | Some reasonings are stronger than we are [Philolaus] |