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Regularity of stable solutions of p -Laplace equations through geometric Sobolev type inequalities

Daniele CastorinaManel Sanchón — 2015

Journal of the European Mathematical Society

We prove a Sobolev and a Morrey type inequality involving the mean curvature and the tangential gradient with respect to the level sets of the function that appears in the inequalities. Then, as an application, we establish a priori estimates for semistable solutions of Δ p u = g ( u ) in a smooth bounded domain Ω n . In particular, we obtain new L r and W 1 , r bounds for the extremal solution u when the domain is strictly convex. More precisely, we prove that u L ( Ω ) if n p + 2 and u L n p n - p - 2 ( Ω ) W 0 1 , p ( Ω ) if n > p + 2 .

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