Cauchy Type Integrals of Algebraic Functions

Details Cauchy Type Integrals of Algebraic Functions Cauchy Type Integrals of Algebraic Functions

2003-12-18

arxiv.org/abs/math/0312353v1

Mathematics

Classical Analysis and ODEs

58 pages, 19 figures

Scientific paper

We consider Cauchy type integrals $I(t)={1\over 2\pi i}\int_{\gamma} {g(z)dz\over z-t}$ with $g(z)$ an algebraic function. The main goal is to give constructive (at least, in principle) conditions for $I(t)$ to be an algebraic function, a rational function, and ultimately an identical zero near infinity. This is done by relating the Monodromy group of the algebraic function $g$, the geometry of the integration curve $\gamma$, and the analytic properties of the Cauchy type integrals. The motivation for the study of these conditions is provided by the fact that certain Cauchy type integrals of algebraic functions appear in the infinitesimal versions of two classical open questions in Analytic Theory of Differential Equations: the Poincar\'e Center-Focus problem and the second part of the Hilbert 16-th problem.

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