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Periodic modules over Gorenstein local rings
It is proved that the minimal free resolution of a module M over a Gorenstein local ring R is eventually periodic if, and only if, the class of M is torsion in a certain Z [t±1]-associated to R. This module, denoted J(R), is the free Z [t±1]-module on the isomorphism classes of finitely generated R-modules modulo relations reminiscent of those defining the Grothendieck group of R. The main result is a structure theorem for J(R) when R is a complete Gorenstein local ring; the link between periodicity and torsion stated above is a corollary.^
Croll, Amanda, "Periodic modules over Gorenstein local rings" (2013). ETD collection for University of Nebraska - Lincoln. AAI3558415.