2 papers
math.RA2026
On classical and Gorenstein homological invariants of rings
José Manuel Fresneda
We prove that, over any ring , the supremum of the projective dimensions of the flat left -modules coincides with the supremum of the Gorenstein projective dimensions of the…
math.RA2026
Weakly Sigma-cotorsion rings
Manuel Cortés-Izurdiaga, Sergio Estrada, José Manuel Fresneda
We study the class of rings for which every direct sum of injective -modules is cotorsion. We call them weakly -cotorsion rings. The defining property might be seen as t…