Abstract Let 𝑅 be a commutative Noetherian ring and let 𝒟 (𝑅) be its (unbounded) derived category. We show that all compactly generated t-structures in 𝒟 (𝑅) associated to a left bounded ...

Bass characterized the rings R with the property that every left R-module has a projective cover. These are the left perfect rings. A ring is left perfect if and only if the class of projective ...