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Weakly-projective covers for left R-modules

机译:左R-模块的弱投射盖

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摘要

All the necessary definitions are given in the introduction. Since it is not true that every left R-module possesses a projective cover, as is the case with injective hulls, it is the aim of this paper to consider a weakened form of a projective cover. In section 2 the concept of a weakly-projective cover is defined and developed. In section 3 this concept is compared with that of a quasi-projective cover. For example it is shown that in the case where a quasi-projective cover can he obtained from an existing projective cover, this quasi-projective cover is nothing more than a weakly-projective cover [Theorem 3.4].
机译:引言中给出了所有必要的定义。由于并非每个左R-模块都具有射影覆盖,这与内射壳一样,因此,本文的目的是考虑射影覆盖的弱化形式。在第2节中,定义并发展了弱投射覆盖的概念。在第3节中,将该概念与准投影掩盖的概念进行了比较。例如,表明在可以从现有的射影覆盖中获得准射影覆盖的情况下,该准射影覆盖只不过是弱射影覆盖[定理3.4]。

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