A Hardy inequality in a twisted Dirichlet-Neumann waveguide
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We consider the Laplacian in a straight strip, subject to a combination of Dirichlet and Neumann boundary conditions. We show that a switch of the respective boundary conditions leads to a Hardy inequality for the Laplacian. As a byproduct of our method, we obtain a simple proof of a theorem of Dittrich and Kriz.
12 pages, LaTeX with 4 EPS figures
12 pages, LaTeX with 4 EPS figures