态射和短正合列的预包络关于直和的封闭性

Preenvelope of Morphisms and Short Exact Sequences on the Closure ofDirect Sum

本文利用左 R-模的预包络关于直和的封闭性, 研究了态射和短正合序列的预包络关于直和的封闭性。

In this paper, we study that the preenvelopes of morphisms and short exact sequences are closed under direct sums using the fact that the preenvelope of left R-module isclosed under direct sums.