Czechoslovak Mathematical Journal, Vol. 49, No. 4, pp. 779-790, 1999

# On oscillatory solutions of fourth order ordinary differential equations

## Oleg Palumbiny

Department of Mathematics, Faculty of Material Sciences and Technology, Slovak University of Technology in Bratislava, Paulinska 16, 917 24 Trnava, Slovakia, e-mail palum@mtf.stuba.sk

Abstract: The paper deals with the oscillation of a differential equation $L_4y+P(t)L_2y+Q(t)y\equiv0$ as well as with the structure of its fundamental system of solutions.

Keywords: linear differential equation, quasi-derivative, monotone solution, Kneser solution, oscillatory solution

Classification (MSC 1991): 34C10; Secondary 34D05

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