7 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] |
16669 | Everything that exists is either a being, or some mode of a being [Malebranche] |
1556 | By nature people are close to one another, but culture drives them apart [Hippias] |
12726 | In a true cause we see a necessary connection [Malebranche] |