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] |
3643 | The concept of mind excludes body, and vice versa [Descartes] |
20575 | Socialist economics needs a very strong central power, virtually leading to slavery [Hayek, by Oksala] |
22599 | Hayek was a liberal, but mainly concerned with market freedom [Hayek, by Dunt] |
22600 | Impeding the market is likely to lead to extensive state control [Hayek] |