4 ideas
19382 | Abstracta are abbreviated ways of talking; there are just substances, and truths about them [Leibniz] |
12812 | Things have real essences, but we categorise them according to the ideas we receive [Locke] |
2614 | Modern phenomenalism holds that objects are logical constructions out of sense-data [Ayer] |
2615 | The concept of sense-data allows us to discuss appearances without worrying about reality [Ayer] |