4 ideas
7791 | The simplest of the logics based on possible worlds is Lewis's S5 [Lewis,CI, by Girle] |
10247 | We have no adequate logic at the moment, so mathematicians must create one [Veblen] |
11002 | Equating necessity with informal provability is the S4 conception of necessity [Lewis,CI, by Read] |
7903 | The six perfections are giving, morality, patience, vigour, meditation, and wisdom [Nagarjuna] |