Bull. Korean Math. Soc. 2019; 56(1): 179-186
Online first article January 14, 2019 Printed January 31, 2019
https://doi.org/10.4134/BKMS.b180173
Copyright © The Korean Mathematical Society.
Feng Feng, Liang Shen
Southeast University; Southeast University
This article mainly concentrates on the open question wheth\-er a right self-injective ring $R$ is necessary QF if $R/S_l$ is left Goldie. It is answered affirmatively under the condition $S_l\subseteq S_r$, where $S_l$ and $S_r$ denote the left socle and right socle of $R$ respectively. And the original condition ``right self-injective" can be weakened to ``right CS and right P-injective". It is also proved that a semiperfect, left and right mininjective ring $R$ is QF if $S_r\subseteq^{ess}R_R$ and $R/S_l$ is left Goldie.
Keywords: QF rings, annihilators, mininjective rings
MSC numbers: Primary 16L60, 16D50
Supported by: The research was supported by the Fundamental Research Funds for the Central Universities (No. 2242017K40085) and NSFC (No.11871145).
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