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On an asymptotic behaviour of solutions of the differential equation of the fourth order. (English) Zbl 0595.34053
Consider the fourth order linear differential equation $(*)\quad y^{(iv)}+p(t)y''+q(t)y'-(-1)^ mr(t)y=0,\quad m=1,2,$ where p,q,r are continuously differentiable functions and $$r(t)>0$$ on [a,$$\infty)$$. The author discusses asymptotic formulae of the first canonical form relative to (*).
Reviewer: V.Lakshmikantham

##### MSC:
 34D05 Asymptotic properties of solutions to ordinary differential equations 34C10 Oscillation theory, zeros, disconjugacy and comparison theory for ordinary differential equations 34A30 Linear ordinary differential equations and systems
##### Keywords:
fourth order linear differential equation
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##### References:
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