Riemann boundary value problems for nonlinear elliptic systems

Abstract
A boundary value problem is solved for the nonlinear first order complex differential equation in the plane. The complex function H is measurable on , Lipschitz continuous with respect to the last two variables, with the Lipschitz constant for the third variable being strictly less than one (ellipticity condition). Moreover, decay conditions at infinity are prescribed. As a boundary condition, the solution w is required to fulfill a classical jump condition, across a given smooth Jordan curve. As a special case, the results extend those already known for the linear equation

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