5 ideas
| 8693 | An 'abstraction principle' says two things are identical if they are 'equivalent' in some respect [Boolos] |
| 17371 | Some kinds are very explanatory, but others less so, and some not at all [Devitt] |
| 8433 | There are few traces of an event before it happens, but many afterwards [Lewis, by Horwich] |
| 17372 | The higher categories are not natural kinds, so the Linnaean hierarchy should be given up [Devitt] |
| 17373 | Species pluralism says there are several good accounts of what a species is [Devitt] |