In this paper, I first give two methods with which we can determine all the power integral bases in maximal real subfields of cyclotomic fields.
本文首先给出了确定分圆域的极大实子域的幂元整基的两种方法；
An algorithm for cyclotomic polynomial test is presented based on that all the roots of a cyclotomic polynomial are unity. The algorithm is directed. simple and realized easily.
本文利用分圆多项式的所有根是单位根的性质，直接从给定的多项式入手，提出了判定一个多项式是否为分圆多项式的算法．算法简单明了，易于实现．。
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