Vanishing of Tate homology and depth formulas over local rings
arXiv:1107.3102
Abstract
Auslander's depth formula for pairs of Tor-independent modules over a regular local ring, depth(M \otimes N) = depth(M) + depth(N) - depth(R), has been generalized in several directions over a span of four decades. In this paper we establish a depth formula that holds for every pair of Tate Tor-independent modules over a Gorenstein local ring. It subsumes previous eneralizations of Auslander's formula and yields exact bounds for vanishing of cohomology over certain Gorenstein rings.
arXiv commentEditorial changes after review. Final version, to appear in J. Pure Appl. Algebra; 19 pp