决定了4p(p是奇素数)阶二面体群的连通3度Cayley图的完全分类,并证明4p阶二面体群不是弱3-CI群,从而否定了C.H.Li关于“所有有限群都是弱3-CI群”的猜想
In this paper we decide the complete classification about connected Cayley graphs of valency 3 dihedral groups of order 4p (p is a prime of odd), and prove that dihedral groups of order 4p is not weak 3- CI- group, which contradicts a conjecture posed by C.H. Li: All finite groups are weak 3- CI- groups.