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] |
5655 | Happiness is not satisfaction of desires, but fulfilment of values [Bradley, by Scruton] |
5974 | People report seeing through rocks, or over the horizon, or impossibly small works [Plutarch] |