3.5 Paradox ☆1. Russells paradox 令A∈A,AgA。 o Russells paradox: Let SAAsA. The question is, does s∈S sie.S∈ Sor SEs? IsEs, 冷IfS∈S, ☆ The statements"S∈s"and"SgS" cannot both be true. thus the contradiction3.5 Paradox ❖ 1.Russell’s paradox ❖ AA, AA。 ❖ Russell’s paradox: Let S={A|AA}. The question is, does SS? ❖ i.e. SS or SS? ❖ If SS, ❖ If SS, ❖ The statements " SS " and " SS " cannot both be true, thus the contradiction