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The aim of this paper is to present sufficient conditions for all bounded solutions of the second order neutral differential equations of the form
(r(t)(x(t) - px(t-τ))')' - q(t)f(x(σ(t))) = 0
to be oscillatory and to compare some existing results.
Some Wintner and Nehari type oscillation criteria are established for the second-order linear delay differential equation.
We study oscillatory properties of solutions of the system of differential equations of neutral type.
Effective sufficient conditions for oscillation and nonoscillation of solutions of some operator-differential equations with piecewise constant argument are found.
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