Periodic solutions for some fully nonlinear fourth order differential equations

Feliz Minhós

doi:10.3934/proc.2011.2011.1068

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2011, Volume 2011: 1068-1077. Doi: 10.3934/proc.2011.2011.1068 open access

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Periodic solutions for some fully nonlinear fourth order differential equations

Feliz Minhós^1,

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

Received: July 2010

Revised: March 2011

Published: August 2017

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Abstract

In this paper we present sufficient conditions for the existence of solutions to the periodic fourth order boundary value problem

$u^((4))(x) = f(x,u(x),u'(x),u''(x),u'''(x))$
$u^((i))(a) = u^((i))(b), i=0,1,2,3,$ for $x \in [a,b],$ and $f : [a,b] \times \mathbb{R}^4\to\mathbb{R}$ a continuous function. To the best of our knowledge it is the first time where this type of general nonlinearities is considered in fourth order equations with periodic boundary conditions.
The difficulties in the odd derivatives are overcome due to the following arguments: the control on the third derivative is done by a Nagumo-type condition and the bounds on the first derivative are obtained by lower and upper solutions, not necessarily ordered.
By this technique, not only it is proved the existence of a periodic solution, but also, some qualitative properties of the solution can be obtained.

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Mathematics Subject Classification: Primary: 34B15; Secondary: 34C25.

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