Comparison and oscillation results for delay difference equations with oscillating coefficients.

Yan, Weiping; Yan, Jurang

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Necessary and sufficient conditions for oscillations of delay partial difference equations.

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In this paper we study two classes of delay partial difference equations with constant coefficients. Explicit necessary and sufficient conditions for the oscillation of the solutions of these equations are obtained.

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Oscillation of delay differential equation with several positive and negative coefficients

E.M. Elabbasy, S.H. Saker (2003)

Discussiones Mathematicae, Differential Inclusions, Control and Optimization

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Some sufficient conditions for oscillation of a first order nonautonomuous delay differential equation with several positive and negative coefficients are obtained.