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Resonance equals reducibility for A-hypergeometric systems
Published 18 Sep 2010 in math.AG | (1009.3569v3)
Abstract: Classical theorems of Gel'fand et al., and recent results of Beukers, show that non-confluent Cohen-Macaulay A-hypergeometric systems have reducible monodromy representation if and only if the continuous parameter is A-resonant. We remove both the confluence and Cohen-Macaulayness conditions while simplifying the proof.
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