... minimal projective resolution 极小射影分解 minimal right ideal 极小右理想 minimal set of covering edges 极小覆盖边集 ...
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普遍极小右理想 universally minimal right ideal
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给出满足主右理想极小条件诣零环的两个充要条件，此类环是扩张闭的。
This peper gives two necessary and sufficient conditions for a ring to be a nil MHR-ring. It is obtained that any nil MHR-ring is extension closed.
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