5 ideas
9616 | A set is a collection into a whole of distinct objects of our intuition or thought [Cantor] |
17743 | De Morgan introduced a 'universe of discourse', to replace Boole's universe of 'all things' [De Morgan, by Walicki] |
15896 | Cantor needed Power Set for the reals, but then couldn't count the new collections [Cantor, by Lavine] |
20795 | Some things are their own criterion, such as straightness, a set of scales, or light [Sext.Empiricus] |
20794 | How can sceptics show there is no criterion? Weak without, contradiction with [Sext.Empiricus] |