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Instability in multi delay functional differential equations of fourth order

Tunç C.

Fasciculi Mathematici

2015

Nr 55

189--198

A vector functional differential equation of the fourth order with multiple deviating arguments is considered. New sufficient conditions are established to guarantee the instability of the zero solution of the equation to be considered. We give an example to illustrate the subject.

Instability to differential equations of fourth order with a variable deviating argument

Tunҫ C.

Journal of Mathematics and Applications

2013

Vol. 36

113--120

The main purpose of this paper is to give two instability theorems to fourth order nonlinear differential equations with a variable deviating argument.

Oscillatory properties of fourth order nonlinear difference equations with quasidifferences

Schmeidel E., Migda M., Musielak A.

Opuscula Mathematica

2006

Vol. 26, no. 2

371-380

In this paper we present the oscillation criterion for a class of fourth order nonlinear difference equations with quasidifferences.