几个有趣的同构结论 Theorem 9.7.All cyclic groups of infinite order are isomorphic to Z. Theorem 9.8.If G is a cyclic group of order n,then G is isomorphic to Zn. Corollary 9.9.If G is a group of order p,where p is a prime number,then G is isomorphic to Zp. Theorem 9.12 Cayley.Every group is isomorphic to a group of permutations.几个有趣的同构结论