3 ideas
18465 | An 'equivalence' relation is one which is reflexive, symmetric and transitive [Kunen] |
7006 | Observing irrelevant items supports both 'all x are y' and 'all x are non-y', revealing its absurdity [Schofield,J] |
5845 | Niceratus learnt the whole of Homer by heart, as a guide to goodness [Xenophon] |