On the Good-$λ$ inequality for nonlinear potentials

Details On the Good-$λ$ inequality for nonlinear potentials On the Good-$λ$ inequality for nonlinear potentials

2011-05-31

arxiv.org/abs/1105.6152v1

Mathematics

Classical Analysis and ODEs

13 pages, submitted

Scientific paper

This note concerns an extension of the good-$\lambda$ inequality for fractional integrals, due to B. Muckenhoupt and R. Wheeden. The classical result is refined in two aspects. Firstly, general nonlinear potentials are considered; and secondly, the constant in the inequality is proven to decay exponentially. As a consequence, the exponential integrability of the gradient of solutions to certain quasilinear elliptic equations is deduced. This in turn is a consequence of certain Morrey space embeddings which extend classical results for the Riesz potential. In addition, the good-$\lambda$ inequality proved here provides an elementary proof of the result of Jawerth, Perez and Welland regarding the positive cone in certain weighted Triebel-Lizorkin spaces.

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