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arXiv · 2606.28244

On the sharp Hölder exponent in the De Giorgi--Nash--Moser theory

André Guerra
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Abstract

We consider solutions of uniformly elliptic equations with measurable coefficients. We assume that the lowest eigenvalue of the coefficient matrix is at least $K^{-1}$ and the largest eigenvalue is at most $K$. In three and higher dimensions we construct $α$-Hölder continuous solutions with $α= \exp(- c_n K)$. This disproves a long-standing conjecture by showing that, except for the two-dimensional case, the Hölder exponent obtained from the Bombieri--Giusti Harnack inequality has the optimal dependence on the ellipticity constant $K$. Using the same construction as a starting point, we disprove a conjecture of De Giorgi about continuity of solutions to non-uniformly elliptic equations.

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André Guerra. 2026-08-26. On the sharp Hölder exponent in the De Giorgi--Nash--Moser theory. https://arxiv.org/abs/2606.28244

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