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Oscillation Criteria for Nonlinear Differential Equations of Second Order with Damping Term

Elabbasy, E. M., Elhaddad, W. W. (2008)

Serdica Mathematical Journal

2000 Mathematics Subject Classification: 34C10, 34C15.Some new criteria for the oscillation of all solutions of second order differential equations of the form (d/dt)(r(t)ψ(x)|dx/dt|α−2(dx/dt))+ p(t)φ(|x|α−2x,r(t) ψ(x)|dx/dt|α−2(dx/dt))+q(t)|x|α−2 x=0, and the more general equation (d/dt)(r(t)ψ(x)|dx/dt|α−2(dx/dt))+p(t)φ(g(x),r(t) ψ(x)|dx/dt|α−2 (dx/dt))+q(t)g(x)=0, are established. our results generalize and extend some known oscillation criterain in the literature.

Oscillation of a forced higher order equation

Witold A. J. Kosmala (1994)

Annales Polonici Mathematici

We state and prove two oscillation results which deal with bounded solutions of a forced higher order differential equation. One proof involves the use of a nonlinear functional.

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 (2009)

Mathematica Bohemica

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.

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