We show that any homeomorphic solution of the Beltrami equation v from the Sobolev class W 1,1loc is a so-called lower Q-homeomorphism with Q(z) = K μ(z), where K μ(z) is the dilatation ratio of this equation. On this basis, we develop the theory of boundary behavior and removing of singularities of these solutions.
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Translated from Ukrains’kyi Matematychnyi Zhurnal, Vol. 63, No. 8, pp. 1078–1091, August, 2011.
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Kovtonyuk, D.A., Petkov, I.V. & Ryazanov, V.I. On the boundary behavior of solutions of the Beltrami equations. Ukr Math J 63, 1241–1255 (2012). https://doi.org/10.1007/s11253-012-0575-7
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DOI: https://doi.org/10.1007/s11253-012-0575-7