MATHEMATICA BOHEMICA, Vol. 134, No. 4, pp. 411-425, 2009

Oscillation of a higher order neutral differential equation with a sub-linear delay term and positive and negative coefficients

Julio G. Dix, Dillip Kumar Ghose, Radhanath Rath

Julio G. Dix, Department of Mathematics, Texas State University, San Marcos TX 78666, USA, e-mail: julio@txstate.edu; Dillip Kumar Ghose, Department of Mathematics, S. K. C. G. College, Paralakimidi, Dt Ganjam, Orissa, India, e-mail: dillip.math@gmail.com; Radhanath Rath, Department of Mathematics, Veer Surendra Sai University of Technilogy, Burla, Dist: Sambalpur, Orissa, India, 768018, e-mail: radhanathmath@yahoo.co.in

Abstract: We obtain sufficient conditions for every solution of the differential equation
[y(t)-p(t)y(r(t))]^{(n)}+v(t)G(y(g(t)))-u(t)H(y(h(t)))=f(t)
to oscillate or to tend to zero as $t$ approaches infinity. In particular, we extend the results of Karpuz, Rath and Padhy (2008) to the case when $G$ has sub-linear growth at infinity. Our results also apply to the neutral equation
[y(t)-p(t)y(r(t))]^{(n)}+q(t)G(y(g(t)))=f(t)
when $q(t)$ has sign changes. Both bounded and unbounded solutions are consideted here; thus some known results are expanded.

Keywords: oscillatory solution, neutral differential equation, asymptotic behaviour

Classification (MSC 2000): 34C10, 34C15, 34K40


Full text available as PDF (smallest), as compressed PostScript (.ps.gz) or as raw PostScript (.ps).

Access to the full text of journal articles on this site is restricted to the subscribers of Myris Trade. To activate your access, please contact Myris Trade at myris@myris.cz.


[Previous Article] [Next Article] [Contents of This Number] [Contents of Mathematica Bohemica]
[Full text of the older issues of Mathematica Bohemica at EMIS]