5 ideas
17743 | De Morgan introduced a 'universe of discourse', to replace Boole's universe of 'all things' [De Morgan, by Walicki] |
14361 | Lewis says indicative conditionals are truth-functional [Lewis, by Jackson] |
8434 | In good counterfactuals the consequent holds in world like ours except that the antecedent is true [Lewis, by Horwich] |
9419 | A law of nature is a general axiom of the deductive system that is best for simplicity and strength [Lewis] |
5470 | The idea of laws of nature arose in the Middle Ages [Hall,AR, by Ellis] |