4 ideas
9390 | Logic guides thinking, but it isn't a substitute for it [Rumfitt] |
10190 | From the axiomatic point of view, mathematics is a storehouse of abstract structures [Bourbaki] |
21982 | I only wish I had such eyes as to see Nobody! It's as much as I can do to see real people. [Carroll,L] |
9389 | Vague membership of sets is possible if the set is defined by its concept, not its members [Rumfitt] |