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Estimates on elliptic equations that hold only where the gradient is large

Abstract : We consider a function which is a viscosity solution of a uniformly elliptic equation only at those points where the gradient is large. We prove that the Hölder estimates and the Harnack inequality, as in the theory of Krylov and Safonov, apply to these functions.
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Submitted on : Thursday, May 5, 2016 - 2:31:06 PM
Last modification on : Thursday, March 19, 2020 - 12:26:02 PM
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Cyril Imbert, Luis Silvestre. Estimates on elliptic equations that hold only where the gradient is large. Journal of the European Mathematical Society, European Mathematical Society, 2016, 18, pp.1321-1338. ⟨10.4171/JEMS/614⟩. ⟨hal-00832550v3⟩

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