4 ideas
9283 | Our ancient beliefs can never be overthrown by subtle arguments [Euripides] |
17962 | The truth-maker principle is that every truth has a sufficient truth-maker [Forrest] |
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] |