... right hand derivative 右方导数 right module 右模 right regular semigroup 右正则半群 ...
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再者，引进了分次半平坦模的概念，并有如下主要结果：环K是分次弱正则的当且仅当所有右K-模是分次半平坦的。
Next, the concept of graded semiflat module is introduced and proved that K is a group-graded weakly regular ring if and only if all right K-module is graded semiflat module.
如所周知，任意右乘法模是拓扑模。
It is well known that any right multiplication module is top.
本文给出并证明了右遗传、右完备环上投射模的对偶模仍然是投射模。
This Paper gives and proves the dual module of a projective module over aright hereditary and right perfect ring is stil projective.
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