9 ideas
19053 | Logic would be more natural if negation only referred to predicates [Dummett] |
14626 | In S5 matters of possibility and necessity are non-contingent [Williamson] |
19052 | Natural language 'not' doesn't apply to sentences [Dummett] |
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] |
14628 | Imagination is important, in evaluating possibility and necessity, via counterfactuals [Williamson] |
18033 | The meaning of a representation is its role in thought, perception or decisions [Block] |