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We use the method of layer potentials to study interior and exterior Dirichlet and Neumann problems for the Helmholtz equation (+k 2)u = 0 on a Lipschitz domain for all wave n umber k 2C with Imk0. Following the approach for the case of smooth boundary [3], we pursue as solution a single layer potential for Neumann problem or a double layer potential for(More)
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