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Kyungpook Mathematical Journal 2021; 61(2): 239-248

Published online June 30, 2021

Copyright © Kyungpook Mathematical Journal.

Weak FI-extending Modules with ACC or DCC on Essential Submodules

Adnan Tercan, Ramazan Yaşar*

Department of Mathematics, Hacettepe University, Beytepe Campus, Ankara 06532, Turkey
e-mail : tercan@hacettepe.edu.tr

Hacettepe-ASO 1.OSB Vocational School, Hacettepe University, 06938 Sincan Ankara, Turkey
e-mail : ryasar@hacettepe.edu.tr

Received: April 19, 2020; Accepted: December 14, 2020

Abstract

In this paper we study modules with the WFI+-extending property. We prove that if M satisfies the WFI+-extending, pseudo duo properties and M/(Soc M) has finite uniform dimension then M decompose into a direct sum of a semisimple submodule and a submodule of finite uniform dimension. In particular, if M satisfies the WFI+-extending, pseudo duo properties and ascending chain (respectively, descending chain) condition on essential submodules then M=M1 ⊕ M2 for some semisimple submodule M1 and Noetherian (respectively, Artinian) submodule M2. Moreover, we show that if M is a WFI-extending module with pseudo duo, C2 and essential socle then the quotient ring of its endomorphism ring with Jacobson radical is a (von Neumann) regular ring. We provide several examples which illustrate our results.

Keywords: CS-module, uniform dimension, ascending chain condition on essential submodules, FI-extending, WFI-extending