域扩张是单根式塔的充分必要条件

Sufficient and necessary conditions for field extensions to be simple radical towers

设K是域F的扩张,利用Galois理论,给出了K是F的单根式塔的一些充分必要条件,并证明了在某些条件下,单根式塔与Galois扩张是等价的。

Let F be a field and K be an extension field of F. Some sufficient and necessary conditions such that K is a simple radical tower of F are given by using primitive root of unity and Galois theory. Moreover, it is proved that under certain conditions K is a simple radical tower of F if and only if K is Galois over F.