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A sharp Hölder estimate for elliptic equations in two variables

Tonia Ricciardi

math.AParXiv:math/0406495

Abstract

We prove a sharp Hölder estimate for solutions of linear two-dimensional, divergence form elliptic equations with measurable coefficients, such that the matrix of the coefficients is symmetric and has unit determinant. Our result extends some previous work by Piccinini and Spagnolo. The proof relies on a sharp Wirtinger type inequality.

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