9 ideas
| 19426 | 'Nominal' definitions just list distinguishing characteristics [Leibniz] |
| 19424 | Knowledge needs clarity, distinctness, and adequacy, and it should be intuitive [Leibniz] |
| 19427 | True ideas represent what is possible; false ideas represent contradictions [Leibniz] |
| 468 | Musical performance can reveal a range of virtues [Damon of Ath.] |
| 19425 | In the schools the Four Causes are just lumped together in a very obscure way [Leibniz] |
| 17402 | Mendeleev saw three principles in nature: matter, force and spirit (where the latter seems to be essence) [Mendeleev, by Scerri] |
| 17399 | Elements don't survive in compounds, but the 'substance' of the element does [Mendeleev] |
| 17401 | Mendeleev had a view of elements which allowed him to overlook some conflicting observations [Mendeleev] |
| 17400 | Mendeleev focused on abstract elements, not simple substances, so he got to their essence [Mendeleev, by Scerri] |