4 ideas
7791 | The simplest of the logics based on possible worlds is Lewis's S5 [Lewis,CI, by Girle] |
12750 | The question is whether force is self-sufficient in bodies, and essential, or dependent on something [Lenfant] |
11002 | Equating necessity with informal provability is the S4 conception of necessity [Lewis,CI, by Read] |
14014 | Space alone, and time alone, will fade away, and only their union has an independent reality [Minkowski] |