设G=H×K为有限群日和K的直积,由Bidwell等定义了AutG的四个特殊子群A,B,C,D满足 并且证明了一个重要结果:如果日和K没有同构的直因子,则AutG=ABCD。在此基础上进一步研究得到了AutG=ABCD的一个简明的充要条件。
Let G=HxK be the direct product of finite groups H and K. In the paper published by Bidwell, Curran and McCaugh- an in 2006, four special subgroups A, B, C, D of AutG were defined firstly, which satisfy and then an important result that AutG=ABCD if H and K have no common direct factor was proven. In this paper a necessary and sufficient condition is given for AutG=ABCD.