5 ideas
7791 | The simplest of the logics based on possible worlds is Lewis's S5 [Lewis,CI, by Girle] |
15201 | That Queen Anne is dead is a 'general fact', not a fact about Queen Anne [Prior,AN] |
11002 | Equating necessity with informal provability is the S4 conception of necessity [Lewis,CI, by Read] |
21516 | We want certainty in order achieve secure results for action [Dewey] |
22899 | 'Thank goodness that's over' is not like 'thank goodness that happened on Friday' [Prior,AN] |