Abstract
Let D be an open connected subset of the complex plane C with sufficiently smooth boundary ∂D. Perturbing the Cauchy problem for the Cauchy–Riemann system ∂̄u = f in D with boundary data on a closed subset S ⊂ ∂D, we obtain a family of mixed problems of the Zaremba-type for the Laplace equation depending on a small parameter ε ∈ (0, 1] in the boundary condition. Despite the fact that the mixed problems include noncoercive boundary conditions on ∂D\S, each of them has a unique solution in some appropriate Hilbert space H +(D) densely embedded in the Lebesgue space L 2(∂D) and the Sobolev–Slobodetskiĭ space H 1/2−δ(D) for every δ > 0. The corresponding family of the solutions {u ε} converges to a solution to the Cauchy problem in H +(D) (if the latter exists). Moreover, the existence of a solution to the Cauchy problem in H +(D) is equivalent to boundedness of the family {u ε} in this space. Thus, we propose solvability conditions for the Cauchy problem and an effective method of constructing a solution in the form of Carleman-type formulas.
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Krasnoyarsk. Translated from Sibirskiĭ Matematicheskiĭ Zhurnal, Vol. 58, No. 4, pp. 870–884, July–August, 2017
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Polkovnikov, A.N., Shlapunov, A.A. Construction of Carleman formulas by using mixed problems with parameter-dependent boundary conditions. Sib Math J 58, 676–686 (2017). https://doi.org/10.1134/S0037446617040140
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DOI: https://doi.org/10.1134/S0037446617040140