5 ideas
| 8970 | Our notion of identical sets involves identical members, which needs absolute identity [Hawthorne] |
| 22308 | Only the actual exists, so possibilities always reduce to actuality after full analysis [Russell] |
| 17371 | Some kinds are very explanatory, but others less so, and some not at all [Devitt] |
| 17373 | Species pluralism says there are several good accounts of what a species is [Devitt] |
| 17372 | The higher categories are not natural kinds, so the Linnaean hierarchy should be given up [Devitt] |