On lifting modules
作者:
Derya Keskin,
期刊:
Communications in Algebra
(Taylor Available online 2000)
卷期:
Volume 28,
issue 7
页码: 3427-3440
ISSN:0092-7872
年代: 2000
DOI:10.1080/00927870008827034
出版商: Gordon and Breach Science Publishers Ltd.
数据来源: Taylor
摘要:
LetRbe a ring with identity and letbe a finite direct sum of relatively protectiveR-modulesMiThen it is proved thatMis lifting if and only ifMis amply supplemented andMiis lifting for all 1 ≤i≤n.Letbe a finite direct sum ofR-modulesMi. We prove thatMis (quasi-) discrete if and only ifare relatively projective (quasi-) discrete modules. We also prove that, for an amply supplementedR-moduleM=M1⊕M2such thatM1andM2have the finite exchange propertyMis lifting if and only ifM1andM2are lifting and relatively small projectiveR-modules and every co-closed submoduleNofMwithM=N+M1=N+M2is a direct summand ofM.Finally, we prove that, for a ringRsuch that every direct sum of a liftingR-module and a simpleR-module is lifting, every simpleR-module is smallM-projective for any liftingR-moduleM.
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