# [其它题目] 求教抽代 群共轭作用 一道课后习题，感谢！

 The class equation of a group $G$ is$1+4+5+5+5$. Does$G$ has a subgroup of order $4$? If so, is it a normal subgroup? (Artin 7.2.14(b)) 是否正规子群不会，请教老师/学长/学姐

GMT+8, 2020-6-1 10:18 , Processed in 1.093750 second(s), 17 queries , Gzip On.