# American Institute of Mathematical Sciences

May  2013, 33(5): 1741-1771. doi: 10.3934/dcds.2013.33.1741

## Persistence of Hölder continuity for non-local integro-differential equations

 1 Department of Mathematics, University of Texas at Austin, 1 University Station, C1200, Austin, TX 78712, United States

Received  December 2011 Revised  April 2012 Published  December 2012

In this paper, we consider non-local integro-differential equations under certain natural assumptions on the kernel, and obtain persistence of Hölder continuity for their solutions. In other words, we prove that a solution stays in $C^\beta$ for all time if its initial data lies in $C^\beta$. This result has an application for a fully non-linear problem, which is used in the field of image processing. In addition, we show Hölder regularity for solutions of drift diffusion equations with supercritical fractional diffusion under the assumption $b\in L^\infty C^{1-\alpha}$ on the divergent-free drift velocity. The proof is in the spirit of [23] where Kiselev and Nazarov established Hölder continuity of the critical surface quasi-geostrophic (SQG) equation.
Citation: Kyudong Choi. Persistence of Hölder continuity for non-local integro-differential equations. Discrete & Continuous Dynamical Systems, 2013, 33 (5) : 1741-1771. doi: 10.3934/dcds.2013.33.1741
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