7 ideas
3750 | "It is true that x" means no more than x [Ramsey] |
10163 | Propositional modal logic has been proved to be complete [Kripke, by Feferman/Feferman] |
10760 | With possible worlds, S4 and S5 are sound and complete, but S1-S3 are not even sound [Kripke, by Rossberg] |
16189 | The variable domain approach to quantified modal logic invalidates the Barcan Formula [Kripke, by Simchen] |
15132 | The Barcan formulas fail in models with varying domains [Kripke, by Williamson] |
1556 | By nature people are close to one another, but culture drives them apart [Hippias] |
18818 | Sentence meaning is given by the actions to which it would lead [Ramsey] |