## Asymptotic behaviour of oscillatory solutions of a fourth-order nonlinear differential equation.(English)Zbl 1015.34019

Summary: Asymptotic behaviour of oscillatory solutions to the fourth-order nonlinear differential equation with quasiderivates $$y^{[4]}+r(t)f(y)=0$$ is studied.

### MSC:

 34C10 Oscillation theory, zeros, disconjugacy and comparison theory for ordinary differential equations 34D05 Asymptotic properties of solutions to ordinary differential equations
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