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Teichmüller's modulsatz and the variation of the Dirichlet integral
V. N. Dubininab a Institute for Applied Mathematics, Far Eastern Branch, Russian Academy of Sciences, Vladivostok
b Novosibirsk State University
Abstract:
We show that changing the level curve of a harmonic function with the classical Hadamard variation with a small parameter entails a change in the Dirichlet integral of the function which is quadratic in the parameter. As a corollary, we supplement the well-known theorem of Teichmüller about the sum of moduli of doubly connected domains into which an annulus is subdivided by a continuum that differs little from a concentric circle.
Keywords:
harmonic function, Dirichlet integral, modulus of a doubly connected domain, condenser capacity.
Received: 24.09.2023 Revised: 24.09.2023 Accepted: 28.11.2023
Citation:
V. N. Dubinin, “Teichmüller's modulsatz and the variation of the Dirichlet integral”, Sibirsk. Mat. Zh., 65:2 (2024), 288–294
Linking options:
https://www.mathnet.ru/eng/smj7855 https://www.mathnet.ru/eng/smj/v65/i2/p288
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Abstract page: | 63 | Full-text PDF : | 3 | References: | 26 | First page: | 14 |
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