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Integral $Ext^2$ between hook Weyl modules (2006.03640v1)
Published 5 Jun 2020 in math.RT
Abstract: This paper concerns representations of the integral general linear group. The extension groups $Ext2$ between any pair of hook Weyl modules are determined via a detailed study of cyclic generators and relations associated to certain extensions. As a corollary, the modular extension groups $Ext1$ between such modules are determined.
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