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On oscillation criteria for third order nonlinear delay differential equations. (English) Zbl 1212.34189
Summary: We are concerned with the oscillation of third order nonlinear delay differential equations of the form \[ (r_{2}(t) (r_{1}(t) x')')'+p(t) x'+q(t) f(x(g(t))) =0. \] We establish some new sufficient conditions which insure that every solution of this equation either oscillates or converges to zero.

MSC:
34K11 Oscillation theory of functional-differential equations
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