11 ideas
| 9193 | ZF set theory has variables which range over sets, 'equals' and 'member', and extensionality [Dummett] |
| 9194 | The main alternative to ZF is one which includes looser classes as well as sets [Dummett] |
| 9195 | Intuitionists reject excluded middle, not for a third value, but for possibility of proof [Dummett] |
| 9186 | First-order logic concerns objects; second-order adds properties, kinds, relations and functions [Dummett] |
| 9187 | Logical truths and inference are characterized either syntactically or semantically [Dummett] |
| 9191 | Ordinals seem more basic than cardinals, since we count objects in sequence [Dummett] |
| 9192 | The number 4 has different positions in the naturals and the wholes, with the same structure [Dummett] |
| 22076 | Being is only perceptible to itself as becoming [Schelling] |
| 22074 | We must show that the whole of nature, because it is effective, is grounded in freedom [Schelling] |
| 22075 | Only idealism has given us the genuine concept of freedom [Schelling] |
| 22818 | Liberals are not too individualistic, because people recognise and value social relations [Kymlicka] |