3 ideas
3299 | In logic identity involves reflexivity (x=x), symmetry (if x=y, then y=x) and transitivity (if x=y and y=z, then x=z) [Baillie] |
12887 | A whole must have one characteristic, an internal relation, and a structure [Rescher/Oppenheim] |
13440 | Causation is the power of one property to produce another, and this gives time its direction [Esfeld] |