YOU HAVE OXT▣ Theorem (Russell's Paradox) xrg rh is not a set. Hengfeng Wei (fweinju.edu.cn Set Theory:Axioms and Operations 2019年11月26日8/38Theorem (Russell’s Paradox) {x | x /∈ x} is not a set. Hengfeng Wei (hfwei@nju.edu.cn) Set Theory: Axioms and Operations 2019 年 11 月 26 日 8 / 38