8 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] |
13550 | To be always happy is to lack knowledge of one half of nature [Seneca] |
5655 | Happiness is not satisfaction of desires, but fulfilment of values [Bradley, by Scruton] |
13549 | Nothing bad can happen to a good man [Seneca] |
13548 | The ocean changes in volume in proportion to the attraction of the moon [Seneca] |