MATHEMATICA BOHEMICA, Vol. 136, No. 2, pp. 205-213, 2011

Positive solutions of third order damped nonlinear differential equations

Miroslav Bartušek, Mariella Cecchi, Zuzana Došlá, Mauro Marini

Miroslav Bartušek, Zuzana Došlá, Department of Mathematics and Statistics, Masaryk University, Kotlářská 2, CZ-611 37 Brno, Czech Republic, e-mail: bartusek@math.muni.cz, dosla@math.muni.cz; Mariella Cecchi, Mauro Marini, Department of Electronic and Telecommunications, University of Florence, I-50139 Florence, Italy, e-mail: mariella.cecchi@unifi.it, mauro.marini@unifi.it

Abstract: We study solutions tending to nonzero constants for the third order differential equation with the damping term
(a_1(t)(a_2(t)x'(t))')'+q(t)x'(t)+r(t)f(x(\varphi(t)))=0
in the case when the corresponding second order differential equation is oscillatory.

Keywords: third order differential equation, damping term, second order oscillatory equation, positive solution, asymptotic properties

Classification (MSC 2010): 34C10


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