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] |
9390 | Logic guides thinking, but it isn't a substitute for it [Rumfitt] |
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] |
9389 | Vague membership of sets is possible if the set is defined by its concept, not its members [Rumfitt] |
15675 | We don't condemn people for being bad at reasoning [Finlayson] |
15674 | One can universalise good advice, but that doesn't make it an obligation [Finlayson] |
15662 | The 'culture industry' is an advertisement for the way things are [Finlayson] |