6 ideas
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] |
19216 | Propositions (such as 'that dog is barking') only exist if their items exist [Williamson] |
1468 | If meaning is use, then religious sentences have meaning because they are used to assert an intention about how to live [Braithwaite, by PG] |