Any sub -group of N yuan symmetrical group is called a N yuan replacement group, referred to as replacement group. The replacement group is the earliest group of research, and it is an important type of non -exchange group. More importantly, each limited abstraction group is homogeneous with a replacement group.
Any sub -group of N yuan symmetrical group is called a N yuan replacement group, referred to as replacement group. The replacement group is the earliest group of research, and it is an important type of non -exchange group. More importantly, each limited abstraction group is homogeneous with a replacement group.