应用中国剩余定理与模 n 剩余类环Zn及其单位群U (Zn )的分解定理,讨论并确定了当群U(Zn)的阶为2pqr的部分情形时, U(Zn)的群结构与 n 的取值,其中p , q , r为素数(不必完全不同)。
Using the Chinese remainder theorem and the decomposition theorem for the structures of the residue class ring mod n and its unit group, the precise values of n and the group structures of U (Zn ) are discussed and determined for some cases in which the order of U (Zn ) is equal to 2pqr, where p, q and r are prime numbers (not necessarily distinct).