4 ideas
10355 | Facts can't make claims true, because they are true claims [Brandom, by Kusch] |
9565 | Zermelo made 'set' and 'member' undefined axioms [Zermelo, by Chihara] |
3339 | For Zermelo's set theory the empty set is zero and the successor of each number is its unit set [Zermelo, by Blackburn] |
11968 | The intension of a sentence is the set of all possible worlds in which it is true [Carnap, by Kaplan] |