In chapter one, we provide some basic known definitions and important conclusions of projective modules, IF rings and semi-simple rings, and so on, which are needed in the paper.
在第一章中我们给出了本文所需用的一些基本定义，以及给出了有关投射模、IF环和半单环等的一些重要已知结论。
In chapter one, we provide some basic known definitions and important conclusions of projective modules, IF rings and semi-simple rings, and so on, which are needed in the paper.
在第一章中我们给出了本文所需用的一些基本定义，以及给出了有关投射模、IF环和半单环等的一些重要已知结论。
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