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Oscillations caused by several retarded and advanced arguments. (English) Zbl 0452.34058


MSC:

34K99 Functional-differential equations (including equations with delayed, advanced or state-dependent argument)
34C15 Nonlinear oscillations and coupled oscillators for ordinary differential equations
34A34 Nonlinear ordinary differential equations and systems
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References:

[1] T. Kusano, On even order functional differential equations with advanced and retarded arguments,J. Differential Equations, in press. · Zbl 0512.34059
[2] Ladas, G.: Sharp conditions for oscillations caused by delays. Applicable anal. 9, 93-98 (1979) · Zbl 0407.34055
[3] G. Ladas and I. P. Stavroulakis, On delay differential inequalities of first order,Funkcial. Ekvac., in press. · Zbl 0492.34060
[4] Ladde, G.S.: Oscillations caused by retarded perturbations of first order linear ordinary differential equations. Atti accad. Naz. lincei rend. Cl. sci. Fis. mat. Natur. 63, 351-359 (1977) · Zbl 0402.34058
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