This paper is concerned with the class of far-field patterns corresponding to the scattering of time-harmonic acoustic plane waves by an inhomogeneous medium which have rho(i)(x) > 0 continuously differentiable density. This class is shown to be complete in L-2(delta Omega) (where delta Omega is the unit sphere) under the same restriction. The existence of a unique weak solution to the interior transmission problem is also established. (C) 2000 Elsevier Science Inc. All rights reserved. [References: 11]
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