factor ring造句

• The main results are listed in the following : it is proved that the ring consisting of all block circulant matrices over a field is isomorphic to a factor ring of a polynomial ring in multivariables over the same field
  具体内容如下： ?证明了域上的所有块循环矩阵组成的环同构于其上的多元多项式环的一个商环。