The outer automorphismgroup of the free product of two cyclic groups is constructed, and two exact formulas for calculating its order are established.
具体地构造出两个有限循环群的自由积的外自同构群,并给出了其阶的计算公式。
3
Under this assumption, the present paper further gives a characterization for the automorphismgroup of C( G, S) in terms of the quotient di-graph and the kernel K.