4 ideas
527 | Everything exists which anyone perceives [Metrodorus of Chios] |
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] |
22307 | Propositions don't name facts, because two opposed propositions can match one fact [Russell] |