Electron. J. Differential Equations, Vol. 2022 (2022), No. 87, pp. 1-22.

Fourth-order differential operators with interior degeneracy and generalized Wentzell boundary conditions

Alessandro Camasta, Genni Fragnelli

Abstract:
In this article we consider the fourth-order operators A_1u:=(au'')'' and A2u:=au'''' in divergence and non divergence form, where a:[0,1]→R+ degenerates in an interior point of the interval. Using the semigroup technique, under suitable assumptions on a, we study the generation property of these operators associated to generalized Wentzell boundary conditions. We prove the well posedness of the corresponding parabolic problems.

Submitted September 28, 2021. Published December 29, 2022.
Math Subject Classifications: 47D06, 35K65, 47B25, 47N20.
Key Words: Degenerate operators in divergence and non divergence form; generalized Wentzell boundary conditions; interior degeneracy.
DOI: https://doi.org/10.58997/ejde.2022.87

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Alessandro Camasta
Department of Mathematics
University of Bari Aldo Moro
Via E. Orabona 4, 70125 Bari, Italy
email: alessandro.camasta@uniba.it
Genni Fragnelli
Department of Ecology and Biology
Tuscia University
Largo dell'Università, 01100 Viterbo, Italy
email: genni.fragnelli@unitus.it

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