3 ideas
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] |
9558 | All scientific tests will verify mathematics, so it is a background, not something being tested [Sober] |