Posing an inverse problem for the Helmho
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Frank Penzel
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Article
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2007
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John Wiley and Sons
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English
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## Abstract In this paper we shall define an inverse problem for the Helmholtz equation with imaginary part of the wave number being positive. The Cauchy data are known on the boundary of the half plane, but it is not known where the half axis, lying vertically in the upper half plane, is situated.