4 ideas
21548 | The null class is the class with all the non-existents as its members [MacColl, by Lackey] |
18086 | Weierstrass eliminated talk of infinitesimals [Weierstrass, by Kitcher] |
18092 | Weierstrass made limits central, but the existence of limits still needed to be proved [Weierstrass, by Bostock] |
12887 | A whole must have one characteristic, an internal relation, and a structure [Rescher/Oppenheim] |