On the Riemann-Hilbert problem IV

With no criteria of the index type, it is proved the existence of a solution for the Riemann-Hilbert problem in the fairly general setting of arbitrary Jordan domains, measurable coefficients and measurable boundary data. The theorem is formulated in terms of harmonic measure and principal asymptotic values. It is also given the corresponding reinforced criterion for domains with arbitrary rectifiable boundaries stated in terms of the natural parameter and nontangential limits. Moreover, it is shown that the dimension of the spaces of solutions is infinite.

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