The Cohomology of Modules over a Complete Intersection Ring

Authors

Jesse Burke, University of Nebraska-LincolnFollow

First Advisor

Srikanth B. Iyengar

Date of this Version

12-2010

Comments

A DISSERTATION Presented to the Faculty of The Graduate College at the University of Nebraska In Partial Fulfillment of Requirements For the Degree of Doctor of Philosophy, Major: Mathematics, Under the Supervision of Srikanth B. Iyengar. Lincoln, Nebraska: December, 2010
Copyright 2010 Jesse Burke

Abstract

We investigate the cohomology of modules over commutative complete intersection rings. The first main result is that if M is an arbitrary module over a complete intersection ring R, and if one even self-extension module of M vanishes then M has finite projective dimension. The second main result gives a new proof of the fact that the support variety of a Cohen-Macaulay module whose completion is indecomposable is projectively connected.