关于Z/pnZ上置换多项式的一个注记

设Z是整数环，2≤n∈Z是一个整数，p是一个奇素数，Z[X]是整系数一多元项式环，J^∪Z[X]是剩余类环Z/p^nZ的化零理想，作者用解析的观点首先证明了剩余类环Z/p^nZ上的任一置换多项式的逆映射也是Z/p^nZ上的置换多项式，从而从解析的角度证明了Z/p^nZ上的置换多项式对于映射的复合运算及对模J的约化作成一个群。

A Note on Permutation Polynomials over Z/pnZ

Let Z be the ring of integers,n∈Z with n ≥2 and p be an odd prime.Let Z[X] be the ring of polynomials over Z and J be the ideal of Z[X] which annihilates the residue class ring Z/pnZ.By analytic viewpoint, the author gives a proof of the result that the inverse of any permutation polynomial over Z/pnZ can be represented by a polynomial and so all permutation polynomials over Z/pnZ form a group according to the operation of composite of maps and reduction mod J.