Abstract
This paper addresses the existence and location results for coupled system with two fourth-order differential equations with dependence on all derivatives in nonlinearities and subject to Lidstone-type boundary conditions. To guarantee the existence and location of the solutions, we applied lower and upper solutions technique and degree theory. In this context, we highlight a new type of Nagumo condition to control the growth of the third derivatives and increases the number of applications, as well as a new type of definitions of upper and lower solutions for such coupled systems. Last section contains an application to a coupled system composed by two fourth order equations, which models the estimated bending of simply-supported beam with torsional solitons.
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Communicated by Julio Rossi.
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de Sousa, R., Minhós, F. Existence and location of solutions to fourth-order Lidstone coupled systems with dependence on odd derivatives. Adv. Oper. Theory 6, 10 (2021). https://doi.org/10.1007/s43036-020-00105-2
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DOI: https://doi.org/10.1007/s43036-020-00105-2
Keywords
- Coupled nonlinear systems
- coupled lower and upper solutions
- Lidstone-type boundary value problems
- operator theory
- simply supported beams