free product of group

• 群的自由积

free product of group的用法和样例：

例句

1. The outer automorphism group of the free product of two syclic 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。