closed extension [数] 闭扩张
closed symmetric extension 闭对称扩张
minimal closed extension [数] 最小闭开拓
closed extension in a group 群内的闭扩张
smallest closed extension [数] 最小闭扩张
closed extension of linear operator 线性算子的闭延拓
Finally we apply these results to study extension closed categories of modules.
最后给出了这些结果在扩张闭模范畴中的应用。
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.
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。
St. Mary’s Clinic, which is in the compound of the Sts. Peter and Paul Cathedral in the Mongolian capital had been closed since April for the building of a new extension.
自今年四月份以来，位于蒙古首都圣伯多禄圣保禄主教座堂庭院的圣玛利诊所，因进行扩建而暂时关闭。
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