Note on almost relative projectives and almost relative injectives

Note on almost relative projectives and almost relative injectives
复制标题

关于几乎相对射影和几乎相对射影的注记

DOI:
--
复制
发表时间:
1992
期刊:
影响因子:
--
通讯作者:
M. Harada
M. Harada
中科院分区:
--
文献类型:
--
作者:
M. Harada

文献摘要

被引文献

相似文献

本文是对[4]、[6]和[7]的补充。在有限长的假设下,我们将证明,当我们研究几乎相对射影时,我们可以仅限于几乎相对射影定义中的某些特殊同态h [6](见§1)。与证明上述事实的方法类似,我们将给出Λ-模MQ是几乎MI投射的一个判据,其中R是完全环,Mi是不可分解的jR-模。在§3中,我们将得到[6]定理1的一个推广,其中研究了局部模的直和。在这一节中,我们将展示不可分解模的直和的相同性质。§§2和4是§§ land 3的双重版本。
This paper is supplemental to [4], [6] and [7]. We shall show, under assumption of finite length, that when we study almost relative projectives, we may restrict ourselves only to certain special homomorphisms h in the definition of almost relative projectives [6] (see §1). In the similar manner to proof of the above fact, we shall give a criterion for an Λ-module MQ to be almost MIprojective, where R is a perfect ring and Mi is an indecomposable jR-module. We shall obtain, in §3, a generalization of [6], Theorem 1, where direct sums of local modules were studied. In this section we shall show the same property on direct sum of indecomposalbe modules. §§2 and 4 are the dual versions of §§land3.