12 ideas
| 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] |
| 3157 | T.H.Huxley gave the earliest clear statement of epiphenomenalism [Huxley, by Rey] |
| 3154 | Brain causes mind, but it doesn't seem that mind causes actions [Huxley] |
| 4867 | Whether nature is beautiful or orderly is entirely in relation to human imagination [Spinoza] |
| 4866 | God is a being with infinite attributes, each of them infinite or perfect [Spinoza] |
| 4868 | Trying to prove God's existence through miracles is proving the obscure by the more obscure [Spinoza] |