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] |
9413 | An event is a change in or to an object [Lombard, by Mumford] |
12709 | Motion is not absolute, but consists in relation [Leibniz] |