文献[1]热运用环论的方法证明了环Z[m~(1/2)]热的商环Z[m~(1/2)]/(a+bm~(1/2))的元素个数是|a2-b2m|.我们将用主理想整环上的模的理论给出一种简洁的证明.
In [1], the author proved that the element number of the quoient ring Z [m]/(a + b m) of integral domain Z [m] is |a^2 --b^2m| by the method of ring theory. We will give a concise proof on this result by the theory of modules over principal ideal domain.