Hypergeometric D-modules and twisted Gauß–Manin systems
Hypergeometric D-modules and twisted Gauß–Manin systems
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DOI:
10.1016/j.jalgebra.2008.09.010
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发表时间:
2007-12
影响因子:
0.9
通讯作者:
M. Schulze;U. Walther
中科院分区:
文献类型:
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作者:
M. Schulze;U. Walther
The Euler–Koszul complex is the fundamental tool in the homological study of A-hypergeometric differential systems and functions. We compare Euler–Koszul homology with D-module direct images from the torus to the base space through orbits in the corresponding toric variety. Our approach generalizes a result by Gel'fand et al. [I.M. Gel'fand, M.M. Kapranov, A.V. Zelevinsky, Generalized Euler integrals and A-hypergeometric functions, Adv. Math. 84 (2) (1990) 255–271, MR MR1080980 (92e:33015), Thm. 4.6] and yields a simpler, more algebraic proof. In the process we extend the Euler–Koszul functor to a category of infinite toric modules and describe multigraded localizations of Euler–Koszul homology.