5 ideas
| 7566 | The Identity of Indiscernibles is really the same as the verification principle [Jolley] |
| 4577 | There is no necessity higher than natural necessity, and that is just regularity [Quine] |
| 17371 | Some kinds are very explanatory, but others less so, and some not at all [Devitt] |
| 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] |