Projective modules and $3$-fold torsion theories
Projective modules and $3$-fold torsion theories
Let R be a ring with identity and R-mod the category of unital left R-modules.A 3-fold torsion theory for R-mod is a triple (%, %, %) of classes of left R-modules such that both (%, %) and (%, %) are torsion theories for R-mod in the sense of Dickson [2].A …