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Asymptotic expansions and unique continuation at Dirichlet-Neumann boundary junctions for planar elliptic equations

1 African Institute for Mathematical Sciences (A.I.M.S.) of Senegal, KM 2, Route de Joal, AIMS-Senegal, B.P. 1418. Mbour, Senegal
2 Università di Milano-Bicocca, Dipartimento di Scienza dei Materiali, Via Cozzi 55, 20125 Milano, Italy
3 Università degli Studi del Piemonte Orientale, Dipartimento di Scienze e Innovazione Tecnologica, Viale Teresa Michel 11, 15121 Alessandria, Italy
4 Université Cheikh Anta Diop, BP 16 889 Dakar-Fann, Senega

We consider elliptic equations in planar domains with mixed boundary conditions of Dirichlet-Neumann type. Sharp asymptotic expansions of the solutions and unique continuation properties from the Dirichlet-Neumann junction are proved.
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