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arXiv · 2607.29290

The Complex Green's Function for Symmetric Sets

Klaus Schiefermayr·Olivier Sète
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Abstract

The aim of this paper is threefold: (i) We study the complex Green's function (the analytic extension of the real Green's function) for multiply connected domains with some symmetry and transform it to a simple form with the help of Walsh's conformal map onto lemniscatic domains. (ii) For the complement of the union of two real intervals, we represent the complex Green's function with the help of Jacobi's elliptic and theta functions. (iii) Using this representation, we explicitly obtain all parameters of the lemniscatic domain corresponding to the complement of the two intervals. In addition, using an equality between the corresponding complex Green's functions, we obtain a numerical method for computing the conformal map from the complement of two intervals onto a lemniscatic domain which yields more accurate results than a previous method from the literature.

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Klaus Schiefermayr, Olivier Sète. 2026-07-31. The Complex Green's Function for Symmetric Sets. https://doi.org/10.1016/j.jmaa.2026.130976

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