A large scaling property of level sets for degenerate p$p$‐Laplacian equations with logarithmic BMO matrix weights

Thanh‐Nhan Nguyen and Minh‐Phuong Tran

Mathematische Nachrichten, 2025, vol. 298, issue 10, 3287-3306

Abstract: In this study, we deal with generalized regularity properties for solutions to p$p$‐Laplace equations with degenerate matrix weights. It has been already observed in previous interesting works that gaining Calderón–Zygmund estimates for nonlinear equations with degenerate weights under the so‐called log-BMO$\log\text{-}\mathrm{BMO}$ condition and minimal regularity assumption on the boundary. In this paper, we also follow this direction and extend general gradient estimates for level sets of the gradient of solutions up to more subtle function spaces. In particular, we construct a covering of the super‐level sets of the spatial gradient |∇u|$|\nabla u|$ with respect to a large scaling parameter via fractional maximal operators.

Date: 2025
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