4 ideas
8920 | Equivalence relations are reflexive, symmetric and transitive, and classify similar objects [Lipschutz] |
16635 | Incorporeal substances are powers or forces [Descartes, by Pasnau] |
467 | A virtue is a combination of intelligence, strength and luck [Ion] |
16684 | Impenetrability only belongs to the essence of extension [Descartes] |