A quasi-commutativity property of the Poisson and composition operators

Details A quasi-commutativity property of the Poisson and composition operators A quasi-commutativity property of the Poisson and composition operators

2009-10-29

arxiv.org/abs/0910.5750v1

Mathematics

Analysis of PDEs

13 pages, no figures

Scientific paper

Let $\Phi$ be a real valued function of one real variable, let $L$ denote an elliptic second order formally self-adjoint differential operator with bounded measurable coefficients, and let $P$ stand for the Poisson operator for $L$. A necessary and sufficient condition on $\Phi ensuring the equivalence of the Dirichlet integrals of $\Phi\circ Ph$ and $P(\Phi\circ h)$ is obtained. We illustrate this result by some sharp inequalities for harmonic functions.

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