研究了正则环上投射根的性质。
We study the properties of projective radicals of regular rings.
由，还证明了分离的阿贝尔正则环是APT环。
By, we prove that a separative Abelian regular ring is an APT ring.
本文给出了分别由约化环类和s -弱正则环类确定的上根的一些基本性质。
Some basic properties of the upper radicals determined by the classes of reduced rings ands-weakly regular rings are presented respectively.
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