**X1-143 (2019/10/21)**

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The Dirichlet problem for the disc, using the conformal transformation
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This boundary-value problem for the disc is studied, that the potential satisfies the Laplace equation inside the disc and the boundary of the disc is the union of tow arcs, on each of them the potential is constant. Using the solution of this problem, the solution of the Dirichlet problem for the Laplace equation on the disc is obtained.