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Wiles Defect for Modules and Criteria for Freeness

Sylvain Brochard, Srikanth B Iyengar, Chandrashekhar B Khare

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Source: Crossref

Published: Mar 25, 2022

DOI: 10.1093/imrn/rnac052

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Source abstract

Abstract Diamond proved a numerical criterion for modules over local rings to be free modules over complete intersection rings. We formulate a refinement of these results using the notion of Wiles defect. A key step in the proof is a formula that expresses the Wiles defect of a module in terms of the Wiles defect of the underlying ring.

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