4 ideas
19404 | Necessities rest on contradiction, and contingencies on sufficient reason [Leibniz] |
18946 | Unreflectively, we all assume there are nonexistents, and we can refer to them [Reimer] |
17743 | De Morgan introduced a 'universe of discourse', to replace Boole's universe of 'all things' [De Morgan, by Walicki] |
19403 | Each of the infinite possible worlds has its own laws, and the individuals contain those laws [Leibniz] |