UNIMPROVABILITY OF ESTIMATES OF HÖLDER CONSTANTS FOR SOLUTIONS OF LINEAR ELLIPTIC EQUATIONS WITH MEASURABLE COEFFICIENTS

1988 ◽  
Vol 60 (1) ◽  
pp. 269-281 ◽  
Author(s):  
M V Safonov
Author(s):  
Tonia Ricciardi

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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