Exceptional parameters for generic A-hypergeometric systems
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The holonomic rank of an A-hypergeometric system $H_A(\beta)$ is conjectured to be independent of the parameter vector $\beta$ if and only if the toric ideal $I_A$ is Cohen Macaulay. We prove this conjecture in the case that $I_A$ is generic by explicitly constructing more than $vol(A)$ many linearly independent hypergeometric functions for parameters $\beta$ coming from embedded primes of certain initial ideals of $I_A$.
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