Rank Jumps in Codimension 2A-hypergeomet
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Laura Felicia Matusevich
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Article
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2001
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Elsevier Science
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English
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The holonomic rank of the A-hypergeometric system H A (ฮฒ) is shown to depend on the parameter vector ฮฒ when the underlying toric ideal I A is a non-Cohen-Macaulay codimension 2 toric ideal. The set of exceptional parameters is usually infinite.