# zbMATH — the first resource for mathematics

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
##### Keywords:
third order; functional differential equation
Full Text: