
Consider linear neutral differential equations of odd order in the form \[ [x(t)- P(t) x(t-\tau)]^{(n)}+ Q(t) x(t-\sigma(t))= 0,\tag{1} \] where \(n\geq 1\), \(\tau> 0\), \(P\), \(Q\), \(\sigma\in C([t_0, \infty),\mathbb{R}^+)\) and \(\lim_{t\to \infty} (t- \sigma(t))= \infty\). The authors prove new necessary and sufficient conditions for oscillation of all solutions of (1) by some comparison methods.
Neutral differential equations, 34K15, Oscillation theory of functional-differential equations, linear neutral differential equations of odd order, comparison theorem, oscillation, 34C10, Oscillation theory, zeros, disconjugacy and comparison theory for ordinary differential equations, Neutral functional-differential equations, comparison methods
Neutral differential equations, 34K15, Oscillation theory of functional-differential equations, linear neutral differential equations of odd order, comparison theorem, oscillation, 34C10, Oscillation theory, zeros, disconjugacy and comparison theory for ordinary differential equations, Neutral functional-differential equations, comparison methods
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