12 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] |
5637 | Nowadays logic is seen as the science of extensions, not intensions [Scruton] |
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] |
5636 | Cartesian 'ideas' confuse concepts and propositions [Scruton] |
5660 | Allegiance is prior to the recognition of individual rights [Scruton] |
22881 | Should we value environmental systems for human benefit, or for their own sake? [Hildebrand] |
5653 | A right is a power which is enforced in the name of justice [Scruton] |