coherence strength(CS)

This paper discussed the direct product and direct limitof left f-projective R-modules and proved that the direct product ofleft f-projective R-modules is left f-projective R-modules if and onlyif R is right strongly coherent.

该文讨论了f-投射模的直积和正向极限,证明了f-投射左R-模的直积是f-投射模的充要条件为R是右强凝聚环。