Notes on Relative Extension Functors

Xu QingBing, Yang Liu,Mohammad Munir, Ayoub Youssefi

JOURNAL OF MATHEMATICS（2022）

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摘要

The objective of this paper is to study the relative homological properties of contravariantly and covariantly finite subcategories. Some sufficient conditions for Ext over bar YnA,B & SIME;Ext over bar XnA,B are obtained. We also give the conditions under which the stable categories C/W/X/W are one-side triangulated categories.

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extension

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