Exponential Sums and Differential Equations. (AM-124)

Exponential Sums and Differential Equations. (AM-124)

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This book is concerned with two areas of mathematics, at first sight disjoint, and with some of the analogies and interactions between them. These areas are the theory of linear differential equations in one complex variable with polynomial coefficients, and the theory of one parameter families of exponential sums over finite fields. After reviewing some results from representation theory, the book discusses results about differential equations and their differential galois groups (G) and one-parameter families of exponential sums and their geometric monodromy groups (G). The final part of the book is devoted to comparison theorems relating G and G of suitably qcorrespondingq situations, which provide a systematic explanation of the remarkable qcoincidencesq found qby handq in the hypergeometric case.... particular the direct limit H2(H, A) must vanish. finite quotients H of T 1 Therefore any given element in H2(H, El N(C)) dies in H2(#, pu N(C)) for some larger finite quotient H of T 1. The covering Z of X defined by such an H sits in a diagram panbsp;...

Title:Exponential Sums and Differential Equations. (AM-124)
Author: Nicholas M. Katz
Publisher:Princeton University Press - 2016-03-02

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