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On Covers of Acts over Semigroups | ||
| Iranian Journal of Science | ||
| مقاله 4، دوره 38، شماره 2، مرداد 2014، صفحه 117-121 اصل مقاله (122.34 K) | ||
| نوع مقاله: Regular Paper | ||
| شناسه دیجیتال (DOI): 10.22099/ijsts.2014.1992 | ||
| نویسندگان | ||
| M. A. Naghipoor* ؛ M. Ershad | ||
| Department of Mathematics, College of Sciences, Shiraz University, P. O. Box 71454, Shiraz, Iran | ||
| چکیده | ||
| 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. | ||
| کلیدواژهها | ||
| Precover of act؛ cover of act؛ torsion free act | ||
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