Bases in the solution space of the Mellin system

Details Bases in the solution space of the Mellin system Bases in the solution space of the Mellin system

2006-09-25

arxiv.org/abs/math/0609675v1

Mathematics

Algebraic Geometry

Scientific paper

Local holomorphic solutions z=z(a) to a univariate sparse polynomial equation p(z) =0, in terms of its vector of complex coefficients a, are classically known to satisfy holonomic systems of linear partial differential equations with polynomial coefficients. In this paper we investigate one of such systems of differential equations which was introduced by Mellin. We compute the holonomic rank of the Mellin system as well as the dimension of the space of its algebraic solutions. Moreover, we construct explicit bases of solutions in terms of the roots of p and their logarithms. We show that the monodromy of the Mellin system is always reducible and give some factorization results in the univariate case.

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