5 ideas
17743 | De Morgan introduced a 'universe of discourse', to replace Boole's universe of 'all things' [De Morgan, by Walicki] |
12741 | If experience is just a dream, it is still real enough if critical reason is never deceived [Leibniz] |
12740 | The strongest criterion that phenomena show reality is success in prediction [Leibniz] |
12721 | Light, heat and colour are apparent qualities, and so are motion, figure and extension [Leibniz] |
19216 | Propositions (such as 'that dog is barking') only exist if their items exist [Williamson] |