3 ideas
18702 | Names, descriptions and predicates refer to things; without that, language and thought are baffling [Davidson] |
8920 | Equivalence relations are reflexive, symmetric and transitive, and classify similar objects [Lipschutz] |
3061 | Anaxarchus said that he was not even sure that he knew nothing [Anaxarchus, by Diog. Laertius] |