Abstract
We obtain sharp integral potential bounds for gradients of solutions to a wide class of quasilinear elliptic equations with measure data. Our estimates are global over bounded domains that satisfy a mild exterior capacitary density condition. They are obtained in Lorentz spaces whose degrees of integrability lie below or near the natural exponent of the operator involved. As a consequence, nonlinear Calderón–Zygmund type estimates below the natural exponent are also obtained for $\mathcal{A}$-superharmonic functions in the whole space ℝn. This answers a question raised in our earlier work (On Calderón–Zygmund theory for p- and $\mathcal{A}$-superharmonic functions, to appear in Calc. Var. Partial Differential Equations, DOI 10.1007/s00526-011-0478-8) and thus greatly improves the result there.
Funding Statement
Supported in part by NSF grant DMS-0901083.
Citation
Nguyen Cong Phuc. "Global integral gradient bounds for quasilinear equations below or near the natural exponent." Ark. Mat. 52 (2) 329 - 354, October 2014. https://doi.org/10.1007/s11512-012-0177-5
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