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Oscillation of neutral differential equation with positive and negative coefficients. (English) Zbl 1118.34053
Summary: We provide oscillation properties of every solution of the neutral differential equation with positive and negative coefficients $$[x(t)-R(t) x(t-r)]'+P(t)x(t-\tau)-Q(t)x(t-\sigma)=0,$$ where $R(t)$, $P(t)$, $Q(t) \in C([t_0,\infty)$, $\bbfR^+)$, $r>0$, $\tau\ge 0,\sigma\ge 0$.

##### MSC:
 34K11 Oscillation theory of functional-differential equations 34K40 Neutral functional-differential equations
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##### References:
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