On the Lipschitz character of orthotropic p-harmonic functions.

We prove that local weak solutions of the orthotropic p-harmonic equation are locally Lipschitz, for every p≥2<inline-graphic></inline-graphic> and in every dimension. More generally, the result holds true for more degenerate equations with orthotropic structure, with right-hand sides in suitable Sobolev spaces. [ABSTRACT FROM AUTHOR]