加入
Elements inverted by an automorphism and the sum of character degrees
Show that an automorphism of a finite group inverts at most as many elements as the sum of the irreducible character degrees.
比较改动
选两个分支看看改了什么，再发起 PR 把工作带过去。
选两个不同的分支
PR 可以从任何一个分支合入任何另一个分支。