12 ideas
| 14626 | In S5 matters of possibility and necessity are non-contingent [Williamson] |
| 13174 | A piece of flint contains something resembling perceptions and appetites [Leibniz] |
| 13175 | Entelechies are analogous to souls, as other minds are analogous to our own minds [Leibniz] |
| 14625 | Necessity is counterfactually implied by its negation; possibility does not counterfactually imply its negation [Williamson] |
| 14623 | Strict conditionals imply counterfactual conditionals: □(A⊃B)⊃(A□→B) [Williamson] |
| 14624 | Counterfactual conditionals transmit possibility: (A□→B)⊃(◊A⊃◊B) [Williamson] |
| 14531 | Rather than define counterfactuals using necessity, maybe necessity is a special case of counterfactuals [Williamson, by Hale/Hoffmann,A] |
| 13172 | What we cannot imagine may still exist [Leibniz] |
| 14628 | Imagination is important, in evaluating possibility and necessity, via counterfactuals [Williamson] |
| 13173 | Death is just the contraction of an animal [Leibniz] |
| 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] |