Factor square full modules

Factor square full modules
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因数平方全模块

DOI:
10.1080/00927872.2020.1870997
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发表时间:
2021
影响因子:
0.7
通讯作者:
Yoshiharu Shibata
Yoshiharu Shibata
中科院分区:
数学3区
文献类型:
--
作者:
Isao Kikumasa;Yosuke Kuratomi;Yoshiharu Shibata

文献摘要

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本文首先引入了“满因子平方”模的概念,其定义如下:对于任意真子模lexofm,存在一个真子模lexofm与一个外胚,并给出了这些模的一些性质。利用这些结果,我们证明了任何拟离散模都是对偶正交的满因子平方模和无双平方模的直接和,并考虑了“什么时候准离散模是拟射影”的问题。此外,我们还研究了因子平方满模在本质扩展或本质子模下闭合的环。
In this paper, we first introduce the concept of “factor-square-full” modules defined as follows: For any proper submoduleXofM, there exist a proper submoduleYofMwithand an epimorphismand give some properties of these modules. Using those results, we show that any quasi-discrete module is a direct sum of a factor-square-full module and a dual-square-free module which are dual orthogonal, and consider the problem “When is a quasi-discrete module quasi-projective?”. Moreover, we study rings whose factor-square-full modules are closed under essential extensions or essential submodules.