14 ideas
| 20349 | Metaphysics aims at the essence of things, and a system to show how this explains other truths [Richardson] |
| 20351 | Metaphysics needs systems, because analysis just obsesses over details [Richardson] |
| 20350 | Metaphysics generalises the data, to get at the ontology [Richardson] |
| 14970 | Normal system K has five axioms and rules [Cresswell] |
| 14971 | D is valid on every serial frame, but not where there are dead ends [Cresswell] |
| 14972 | S4 has 14 modalities, and always reduces to a maximum of three modal operators [Cresswell] |
| 14973 | In S5 all the long complex modalities reduce to just three, and their negations [Cresswell] |
| 14976 | Reject the Barcan if quantifiers are confined to worlds, and different things exist in other worlds [Cresswell] |
| 14974 | A relation is 'Euclidean' if aRb and aRc imply bRc [Cresswell] |
| 14975 | A de dicto necessity is true in all worlds, but not necessarily of the same thing in each world [Cresswell] |
| 20356 | Humans dominate because, unlike other animals, they have a synthesis of conflicting drives [Richardson] |
| 13304 | Learned men gain more in one day than others do in a lifetime [Posidonius] |
| 20366 | A mind that could see cause and effect as a continuum would deny cause and effect [Richardson] |
| 20820 | Time is an interval of motion, or the measure of speed [Posidonius, by Stobaeus] |