11 ideas
8207 | The quest for simplicity drove scientists to posit new entities, such as molecules in gases [Quine] |
8208 | In arithmetic, ratios, negatives, irrationals and imaginaries were created in order to generalise [Quine] |
14626 | In S5 matters of possibility and necessity are non-contingent [Williamson] |
13007 | Archimedes defined a straight line as the shortest distance between two points [Archimedes, by Leibniz] |
8205 | Explaining events just by bodies can't explain two events identical in space-time [Quine] |
14625 | Necessity is counterfactually implied by its negation; possibility does not counterfactually imply its negation [Williamson] |
8206 | Necessity could be just generalisation over classes, or (maybe) quantifying over possibilia [Quine] |
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] |