4 ideas
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] |
12887 | A whole must have one characteristic, an internal relation, and a structure [Rescher/Oppenheim] |
14380 | The distinction between necessary and essential properties can be ignored [Rocca] |