Existence and multiplicity of solutions in fourth order BVPs with unbounded nonlinearities

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2013, 2013(special): 555-564. doi: 10.3934/proc.2013.2013.555

Existence and multiplicity of solutions in fourth order BVPs with unbounded nonlinearities

1.	Departamento de Matemática. Universidade de Évora, Centro de Investigação em Matemática e Aplicaçoes da U.E. (CIMA-UE), Rua Romão Ramalho, 59. 7000-671 Évora
2.	College of the Bahamas, School of Mathematics, Physics and Technologies, Department of Mathematics, Oakes Field Campus, Nassau, Bahamas

Received September 2012 Revised April 2013 Published November 2013

Abstract
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In this work the authors present some existence, non-existence and location results of the problem composed of the fourth order fully nonlinear equation \begin{equation*} u^{\left( 4\right) }\left( x\right) +f( x,u\left( x\right) ,u^{\prime }\left( x\right) ,u^{\prime \prime }\left( x\right) ,u^{\prime \prime \prime }\left( x\right) ) =s\text{ }p(x) \end{equation*} for $x\in \left[ a,b\right] ,$ where $f:\left[ a,b\right] \times \mathbb{R} ^{4}\rightarrow \mathbb{R},$ $p:\left[ a,b\right] \rightarrow \mathbb{R}^{+}$ are continuous functions and $s$ a real parameter, with the boundary conditions \begin{equation*} u\left( a\right) =A,\text{ }u^{\prime }\left( a\right) =B,\text{ }u^{\prime \prime \prime }\left( a\right) =C,\text{ }u^{\prime \prime \prime }\left( b\right) =D,\text{ } \end{equation*} for $A,B,C,D\in \mathbb{R}.$ In this work they use an Ambrosetti-Prodi type approach, with some new features: the existence part is obtained in presence of nonlinearities not necessarily bounded, and in the multiplicity result it is not assumed a speed growth condition or an asymptotic condition, as it is usual in the literature for these type of higher order problems.
The arguments used apply lower and upper solutions technique and topological degree theory.
An application is made to a continuous model of the human spine, used in aircraft ejections, vehicle crash situations, and some forms of scoliosis.

Keywords: one-sided Nagumo condition, non-existence and multiplicity of solutions., Higher order Ambrosetti-Prodi problems, existence.

Mathematics Subject Classification: Primary: 34B15; Secondary: 34B18, 47H1.

Citation: Feliz Minhós, João Fialho. Existence and multiplicity of solutions in fourth order BVPs with unbounded nonlinearities. Conference Publications, 2013, 2013 (special) : 555-564. doi: 10.3934/proc.2013.2013.555

References:

[1]	A. Cabada, R. Pouso and F. Minhós, Extremal solutions to fourth-order functional boundary value problems including multipoint condition., Nonlinear Anal.: Real World Appl., (2009), 2157. Google Scholar
[2]	C. Fabry, J. Mawhin and M. N. Nkashama, A multiplicity result for periodic solutions of forced nonlinear second order ordinary differential equations., Bull. London Math. Soc., 18 (1986), 173. Google Scholar
[3]	J. Fialho and F. Minhós, Existence and location results for hinged beams with unbounded nonlinearities,, Nonlinear Anal., 71 (2009). Google Scholar
[4]	J. Fialho, F. Minhós, On higher order fully periodic boundary value problems,, J. Math. Anal. Appl., (2012), 616. Google Scholar
[5]	J. Graef, L. Kong and B. Yang, Existence of solutions for a higher-order multi-point boundary value problem,, Result. Math., (2009), 77. Google Scholar
[6]	M.R. Grossinho, F.M. Minhós, A.I. Santos, olvability of some third-order boundary value problems with asymmetric unbounded linearities,, Nonlinear Analysis, (2005), 1235. Google Scholar
[7]	M.R. Grossinho, F. Minhós and A. I. Santos, A note on a class of problems for a higher order fully nonlinear equation under one sided Nagumo type condition,, Nonlinear Anal., (2009), 4027. Google Scholar
[8]	J. Mawhin, Topological degree methods in nonlinear boundary value problems,, Regional Conference Series in Mathematics, (1979). Google Scholar
[9]	F. Minhós, Existence, nonexistence and multiplicity results for some beam equations, Progress in Nonlinear Differential Equations and Their Applications,, Vol. 75, (2007), 245. Google Scholar
[10]	F. Minhós, On some third order nonlinear boundary value problems: existence, location and multiplicity results,, J. Math. Anal. Appl., (2008), 1342. Google Scholar
[11]	F. Minhós and J. Fialho, Ambrosetti-Prodi type results to fourth order nonlinear fully differential equations,, Proceedings of Dynamic Systems and Applications, (2008), 325. Google Scholar
[12]	F. Minhós, Location results: an under used tool in higher order boundary value problems,, International Conference on Boundary Value Problems: Mathematical Models in Engineering, (1124), 244. Google Scholar
[13]	G. Noone and W.T.Ang, The inferior boundary condition of a continuous cantilever beam model of the human spine,, Australian Physical & Engineering Sciences in Medicine, 19 (1996), 26. Google Scholar
[14]	A. Patwardhan, W. Bunch, K. Meade, R. Vandeby and G. Knight, A biomechanical analog of curve progression and orthotic stabilization in idiopathic scoliosis,, J. Biomechanics, 19 (1986), 103. Google Scholar
[15]	M. Šenkyřík, Existence of multiple solutions for a third order three-point regular boundary value problem,, Mathematica Bohemica, (1994), 113. Google Scholar

show all references

References:

[1]	A. Cabada, R. Pouso and F. Minhós, Extremal solutions to fourth-order functional boundary value problems including multipoint condition., Nonlinear Anal.: Real World Appl., (2009), 2157. Google Scholar
[2]	C. Fabry, J. Mawhin and M. N. Nkashama, A multiplicity result for periodic solutions of forced nonlinear second order ordinary differential equations., Bull. London Math. Soc., 18 (1986), 173. Google Scholar
[3]	J. Fialho and F. Minhós, Existence and location results for hinged beams with unbounded nonlinearities,, Nonlinear Anal., 71 (2009). Google Scholar
[4]	J. Fialho, F. Minhós, On higher order fully periodic boundary value problems,, J. Math. Anal. Appl., (2012), 616. Google Scholar
[5]	J. Graef, L. Kong and B. Yang, Existence of solutions for a higher-order multi-point boundary value problem,, Result. Math., (2009), 77. Google Scholar
[6]	M.R. Grossinho, F.M. Minhós, A.I. Santos, olvability of some third-order boundary value problems with asymmetric unbounded linearities,, Nonlinear Analysis, (2005), 1235. Google Scholar
[7]	M.R. Grossinho, F. Minhós and A. I. Santos, A note on a class of problems for a higher order fully nonlinear equation under one sided Nagumo type condition,, Nonlinear Anal., (2009), 4027. Google Scholar
[8]	J. Mawhin, Topological degree methods in nonlinear boundary value problems,, Regional Conference Series in Mathematics, (1979). Google Scholar
[9]	F. Minhós, Existence, nonexistence and multiplicity results for some beam equations, Progress in Nonlinear Differential Equations and Their Applications,, Vol. 75, (2007), 245. Google Scholar
[10]	F. Minhós, On some third order nonlinear boundary value problems: existence, location and multiplicity results,, J. Math. Anal. Appl., (2008), 1342. Google Scholar
[11]	F. Minhós and J. Fialho, Ambrosetti-Prodi type results to fourth order nonlinear fully differential equations,, Proceedings of Dynamic Systems and Applications, (2008), 325. Google Scholar
[12]	F. Minhós, Location results: an under used tool in higher order boundary value problems,, International Conference on Boundary Value Problems: Mathematical Models in Engineering, (1124), 244. Google Scholar
[13]	G. Noone and W.T.Ang, The inferior boundary condition of a continuous cantilever beam model of the human spine,, Australian Physical & Engineering Sciences in Medicine, 19 (1996), 26. Google Scholar
[14]	A. Patwardhan, W. Bunch, K. Meade, R. Vandeby and G. Knight, A biomechanical analog of curve progression and orthotic stabilization in idiopathic scoliosis,, J. Biomechanics, 19 (1986), 103. Google Scholar
[15]	M. Šenkyřík, Existence of multiple solutions for a third order three-point regular boundary value problem,, Mathematica Bohemica, (1994), 113. Google Scholar

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