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Harmonic and Trace Inequalities in Lipschitz Domains

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Frontiers in Functional Equations and Analytic Inequalities

Abstract

We prove boundary inequalities in arbitrary bounded Lipschitz domains on the trace space of Sobolev spaces. For that, we make use of the trace operator, its Moore–Penrose inverse, and of a special inner product. We show that our trace inequalities are particularly useful to prove harmonic inequalities, which serve as powerful tools to characterize the harmonic functions on Sobolev spaces of non-integer order.

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Acknowledgements

This research is part of the first author’s Ph.D. project, which is carried out at Moulay Ismail University, Meknes. It was essentially finished during a visit of Touhami to the Department of Mathematics of University of Aveiro, Portugal, November 2018. The hospitality of the host institution and the financial support of Moulay Ismail University, Morocco, and CIDMA, Portugal, are here gratefully acknowledged. Torres was partially supported by the Portuguese Foundation for Science and Technology (FCT) through CIDMA, project UID/MAT/04106/2019.

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Correspondence to Delfim F.  M. Torres .

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Touhami, S., Chaira, A., Torres, D.F. . (2019). Harmonic and Trace Inequalities in Lipschitz Domains. In: Anastassiou, G., Rassias, J. (eds) Frontiers in Functional Equations and Analytic Inequalities. Springer, Cham. https://doi.org/10.1007/978-3-030-28950-8_30

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