On Covers of Acts over Semigroups

被引：0

作者：

Naghipoor, M. A. ^{[1
]}

Ershad, M. ^{[1
]}

机构：

[1] Shiraz Univ, Coll Sci, Dept Math, Shiraz, Iran

来源：

IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY TRANSACTION A-SCIENCE | 2014年 / 38卷 / A2期

关键词：

Precover of act; cover of act; torsion free act; FLAT COVERS;

D O I：

暂无

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Let S be a monoid and X a class of S-acts which is closed under coproducts. The object of this article is to find conditions under which all S-acts have X-precovering. We have shown that the existence of torsion-free precovering implies the existence of torsion-free covering. This work is an attempt to further facilitate the study of the conjecture that all S-acts have flat cover.

引用

页码：117 / 121

页数：5

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