Abstract

In this article, we characterize the relative Ext groups of abelian categories relative to a fixed precovering class $\Cal{F}$ and give some examples.

Keywords: Relative Ext group; precovering; $\mathcal{F}$-resolution.

MSC: 18G15, 18G25

Pages:  364--372     

Volume  65 ,  Issue  3 ,  2013