Regularity Theory for Quasilinear Elliptic Systems and Monge - Ampere Equations in Two Dimensions by Friedmar Schulz.
These lecture notes have been written as an introduction to the characteristic theory for two-dimensional Monge-Ampère equations, a theory largely developed by H. Lewy and E. Heinz which has never been presented in book form. An exposition of the Heinz-Lewy theory requires auxiliary material which c...
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