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.
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页码：117 / 121
页数：5
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