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math.AG1999
GG-functions and their relations to A-hypergeometric functions
Israel M. Gelfand, Mark I. Graev
We describe a new approach to the notion of general hypergeometric functions
math.DG1999
Webs, Lenard schemes, and the local geometry of bihamiltonian Toda and Lax structures
Israel M. Gelfand, Ilya Zakharevich
We introduce a criterion that a given bihamiltonian structure allows a local coordinate system where both brackets have constant coefficients. This criterion is applied to the biha…