10 ideas
| 11193 | Understanding begins with the notion of being and essence [Avicenna] |
| 10496 | Monothetic categories have fixed defining features, and polythetic categories do not [Ellen] |
| 10497 | In symbolic classification, the categories are linked to rules [Ellen] |
| 10494 | Several words may label a category; one word can name several categories; some categories lack words [Ellen] |
| 10495 | Continuous experience sometimes needs imposition of boundaries to create categories [Ellen] |
| 11209 | The simple's whatness is its very self [Avicenna] |
| 11204 | The ultimate material of things has the unity of total formlessness [Avicenna] |
| 15036 | An essence can either be universal (in the mind) or singular (in concrete particulars) [Avicenna, by Panaccio] |
| 3061 | Anaxarchus said that he was not even sure that he knew nothing [Anaxarchus, by Diog. Laertius] |
| 10498 | Classification is no longer held to be rooted in social institutions [Ellen] |