11 ideas
14626 | In S5 matters of possibility and necessity are non-contingent [Williamson] |
16186 | The Barcan Formulas express how to combine modal operators with classical quantifiers [Simchen] |
16187 | The Barcan Formulas are orthodox, but clash with the attractive Actualist view [Simchen] |
16190 | BF implies that if W possibly had a child, then something is possibly W's child [Simchen] |
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] |
16188 | Serious Actualism says there are no facts at all about something which doesn't exist [Simchen] |
19699 | A Gettier case is a belief which is true, and its fallible justification involves some luck [Hetherington] |
14628 | Imagination is important, in evaluating possibility and necessity, via counterfactuals [Williamson] |