Abstract
The paper deals with two nonlinear elliptic equations with (p, q)-Laplacian and the Dirichlet–Neumann–Dirichlet (DND) boundary conditions, and Dirichlet–Neumann–Neumann (DNN) boundary conditions, respectively. Under mild hypotheses, we prove the unique weak solvability of the elliptic mixed boundary value problems. Then, a comparison and a monotonicity results for the solutions of elliptic mixed boundary value problems are established. We examine a convergence result which shows that the solution of (DND) can be approached by the solution of (DNN). Moreover, two optimal control problems governed by (DND) and (DNN), respectively, are considered, and an existence result for optimal control problems is obtained. Finally, we provide a result on asymptotic behavior of optimal controls and system states, when a parameter tends to infinity.
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Acknowledgements
The authors wish to thank the two knowledgeable referees for their useful remarks in order to improve the paper. This project has received funding from the NNSF of China Grant Nos. 12001478, 12026255, 12026256 and 12001463, the European Union’s Horizon 2020 Research and Innovation Programme under the Marie Skłodowska-Curie grant agreement No. 823731 CONMECH, National Science Center of Poland under Project No. 2021/41/B/ST1/01636, and the Startup Project of Doctor Scientific Research of Yulin Normal University No. G2020ZK07. It is also supported by Natural Science Foundation of Guangxi Grant Nos. 2021GXNSFFA196004, 2020GXNSFBA297137 and 2018GXNSFAA281353, and the Ministry of Science and Higher Education of Republic of Poland under Grants Nos. 4004/GGPJII/H2020/2018/0 and 440328/PnH2/2019.
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Zeng, S., Migórski, S., Tarzia, D.A. et al. A class of elliptic mixed boundary value problems with (p, q)-Laplacian: existence, comparison and optimal control. Z. Angew. Math. Phys. 73, 151 (2022). https://doi.org/10.1007/s00033-022-01789-7
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DOI: https://doi.org/10.1007/s00033-022-01789-7