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On normal solvability of the Riemann problem with singular coefficient
Authors:M. Rakowski   I. Spitkovsky
Affiliation:Department of Mathematics, The Ohio State University, Columbus, Ohio 43210 ; Department of Mathematics, The College of William and Mary, Williamsburg, Virginia 23187-8795
Abstract:
Suppose $G$ is a singular matrix function on a simple, closed, rectifiable contour $Gamma $. We present a necessary and sufficient condition for normal solvability of the Riemann problem with coefficient $G$ in the case where $G$ admits a spectral (or generalized Wiener-Hopf) factorization $G_{+} Lambda G_{-}$ with $G_{-}^{pm 1}$ essentially bounded. The boundedness of $G_{-}^{pm 1}$ is not required when $G$ takes injective values a.e. on $Gamma $.

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