在多种情况下对于有限群G的共轭类类长集合cs(G)证明了|cs(G)|≤2·k'(G)+1其中k'(G)=maxp||G|{csp(G)},csp(G)为cs(G)中能被素数p整除的元素集。
Let G be a finiteGroup, es(G) be a set of all the lengths of the Conjugacy classes of a finiteGroup G, in this paper, they showed that |cs(G)|≤2·k'(G)+1 in many cases, here k'(G)=maxp||G|{csp(G)} and csp (G) is a set of all elements in |cs(G) | that can be divisible by a prime p.