环扩张与(d,n)-余挠模及(d,n)-平坦模

The Extension of Rings and (d,n)-cotorsion Modules and(d,n)-flat Modules

设R是环,本文讨论了(d,n)-余挠模与(d,n)-平坦模在分式环上的若干性质,并给出了这两类模在Morita等价环上的等价刻画。

Let R be any rings. The property of（ d,n）-cotorsion modules and（ d,n）-flat modules on rings of quotients are investigated,the equivalent descriptions of these modules on Morita Equivalence rings are given.