12 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] |
| 20725 | The idea of duty in one's calling haunts us, like a lost religion [Weber] |
| 20722 | Acquisition and low consumption lead to saving, investment, and increased wealth [Weber] |
| 20724 | When asceticism emerged from the monasteries, it helped to drive the modern economy [Weber] |
| 20717 | Capitalism is not unlimited greed, and may even be opposed to greed [Weber] |
| 20718 | Modern western capitalism has free labour, business separate from household, and book-keeping [Weber] |
| 1748 | Archelaus was the first person to say that the universe is boundless [Archelaus, by Diog. Laertius] |
| 5989 | Archelaus said life began in a primeval slime [Archelaus, by Schofield] |
| 20719 | Punish the heretic, but be indulgent to the sinner [Weber] |