6 ideas
18465 | An 'equivalence' relation is one which is reflexive, symmetric and transitive [Kunen] |
23647 | Objects have an essential constitution, producing its qualities, which we are too ignorant to define [Reid] |
23283 | Necessity implies possibility, but in experience it matters which comes first [Williams,B] |
11958 | Impossibilites are easily conceived in mathematics and geometry [Reid, by Molnar] |
23646 | Reference is by name, or a term-plus-circumstance, or ostensively, or by description [Reid] |
23645 | A word's meaning is the thing conceived, as fixed by linguistic experts [Reid] |