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Poincaré series of modules over compressed Gorenstein local rings
Authors:Maria Evelina Rossi  Liana M. Şega
Affiliation:1. Department of Mathematics of Genoa, Via Dodecaneso 35, 16146 Genova, Italy;2. Department of Mathematics and Statistics, University of Missouri, Kansas City, MO 64110, USA
Abstract:
Given two positive integers e and s we consider Gorenstein Artinian local rings R   whose maximal ideal mm satisfies ms≠0=ms+1ms0=ms+1 and rankR/m(m/m2)=erankR/m(m/m2)=e. We say that R is a compressed Gorenstein local ring   when it has maximal length among such rings. It is known that generic Gorenstein Artinian algebras are compressed. If s≠3s3, we prove that the Poincaré series of all finitely generated modules over a compressed Gorenstein local ring are rational, sharing a common denominator. A formula for the denominator is given. When s is even this formula depends only on the integers e and s  . Note that for s=3s=3 examples of compressed Gorenstein local rings with transcendental Poincaré series exist, due to Bøgvad.
Keywords:primary, 13D02   secondary, 13A02, 13D07, 13H10
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