15 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] |
| 21642 | If quantification is all substitutional, there is no ontology [Quine] |
| 21982 | I only wish I had such eyes as to see Nobody! It's as much as I can do to see real people. [Carroll,L] |
| 1633 | Absolute ontological questions are meaningless, because the answers are circular definitions [Quine] |
| 18964 | Ontology is relative to both a background theory and a translation manual [Quine] |
| 14974 | A relation is 'Euclidean' if aRb and aRc imply bRc [Cresswell] |
| 18965 | We know what things are by distinguishing them, so identity is part of ontology [Quine] |
| 14975 | A de dicto necessity is true in all worlds, but not necessarily of the same thing in each world [Cresswell] |
| 1634 | Two things are relative - the background theory, and translating the object theory into the background theory [Quine] |
| 8470 | Reference is inscrutable, because we cannot choose between theories of numbers [Quine, by Orenstein] |
| 18963 | Indeterminacy translating 'rabbit' depends on translating individuation terms [Quine] |