4 ideas
21548 | The null class is the class with all the non-existents as its members [MacColl, by Lackey] |
9390 | Logic guides thinking, but it isn't a substitute for it [Rumfitt] |
9389 | Vague membership of sets is possible if the set is defined by its concept, not its members [Rumfitt] |
8209 | Part of the folk concept of qualia is what makes recognition and comparison possible [Lewis] |