4 ideas
9390 | Logic guides thinking, but it isn't a substitute for it [Rumfitt] |
18201 | General principles can be obvious in mathematics, but bold speculations in empirical science [Parsons,C] |
14248 | We could accept the integers as primitive, then use sets to construct the rest [Cohen] |
9389 | Vague membership of sets is possible if the set is defined by its concept, not its members [Rumfitt] |