Oscillation criteria of second order nonlinear neutral differential equations

Abstract

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This paper is concerned with the oscillation of second-order nonlinear neu-tral dierential equations of the form[r(t)[(x(t) + p(t)x((t)))']'+ f(t; x( (t))) = 0;by using a generalized Riccati's technique and integral averaging technique, weestablish new oscillation results which handle some cases not covered by knowncriteria.