本文给出p—遗传环的定义及循环模的子模闭的充要条件。
This paper gives the definition of P-hereditary ring and discusses the necessary and sufficient condition about the submodule closure of cyclic module.
是右半遗传环当且仅当任一右R 模的两个上平坦子模的和上平坦；
R is semihereditary ring if and only if the sum of two coflat submodules of every R module is coflat module;
遗传和环紧的相对影响在同卵双胞胎中最易观察到。
The relative effects of heredity and environment are most clearly observable in identical twins.
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