This thesis is made up of three chapters:The first chapter defines simple-projective modules. Some equivalent conditions and some characterizations of simple-projective modules are given;More over,we introduce the left SP-rings and prove that the left SP-rings are Morita invariant.
本学位论文共分为三章:第一章引进了单投射模的概念,给出单投射模的等价条件,并讨论了它的一些性质;进一步地,介绍了SP-环的定义,证明了SP-环是Mortia不变的,并利用单投射模刻画了左V-环;最后给出了相对于单投射模的Schanuel引理。
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