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A strong maximum principle for the fractional laplace equation with mixed boundary condition

  • Rafael López-Soriano and Alejandro Ortega EMAIL logo
Published/Copyright: November 22, 2021

Abstract

In this work we prove a strong maximum principle for fractional elliptic problems with mixed Dirichlet–Neumann boundary data which extends the one proved by J. Dávila (cf. [11]) to the fractional setting. In particular, we present a comparison result for two solutions of the fractional Laplace equation involving the spectral fractional Laplacian endowed with homogeneous mixed boundary condition. This result represents a non–local counterpart to a Hopf’s Lemma for fractional elliptic problems with mixed boundary data.

MSC 2010: 26A33; 35B50; 35R11; 35S15

Acknowledgements

This work has been supported by the Madrid Government under the Multiannual Agreement with UC3M in the line of Excellence of University Professors (EPUC3M23), and in the context of the V PRICIT (Regional Programme of Research and Technological Innovation). The authors are partially supported by the Ministry of Economy and Competitiveness of Spain, under research project PID2019-106122GB-I00.

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Received: 2021-03-08
Revised: 2021-10-11
Published Online: 2021-11-22
Published in Print: 2021-12-20

© 2021 Diogenes Co., Sofia

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