5 ideas
15927 | Definition just needs negation, known variables, conjunction, disjunction, substitution and quantification [Weyl, by Lavine] |
7726 | Aristotelian logic dealt with inferences about concepts, and there were also proposition inferences [Weiner] |
1757 | The Electra: she knows this man, but not that he is her brother [Eucleides, by Diog. Laertius] |
3028 | The chief good is unity, sometimes seen as prudence, or God, or intellect [Eucleides] |
10246 | The limit of science is isomorphism of theories, with essences a matter of indifference [Weyl] |