15 ideas
14626 | In S5 matters of possibility and necessity are non-contingent [Williamson] |
9358 | There are several logics, none of which will ever derive falsehoods from truth [Lewis,CI] |
9357 | Excluded middle is just our preference for a simplified dichotomy in experience [Lewis,CI] |
9364 | Names represent a uniformity in experience, or they name nothing [Lewis,CI] |
14625 | Necessity is counterfactually implied by its negation; possibility does not counterfactually imply its negation [Williamson] |
9362 | Necessary truths are those we will maintain no matter what [Lewis,CI] |
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] |
9365 | We can maintain a priori principles come what may, but we can also change them [Lewis,CI] |
14628 | Imagination is important, in evaluating possibility and necessity, via counterfactuals [Williamson] |
9361 | We have to separate the mathematical from physical phenomena by abstraction [Lewis,CI] |
1748 | Archelaus was the first person to say that the universe is boundless [Archelaus, by Diog. Laertius] |
9363 | Science seeks classification which will discover laws, essences, and predictions [Lewis,CI] |
5989 | Archelaus said life began in a primeval slime [Archelaus, by Schofield] |