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Some oscillatory properties of second order non linear differential equations.V ~[ARKO SVEC (Bratislava, Czechoslovakia)(*)Summary. -The aim of this note is to shotv that, under certain conditions, the comparison theorems between a nonlinear second order differential equation of certain type and a linear second order differential equation hold. From this roe shall be able to guarentee the oscillatory or nonoscillatory character of certain or all solutions of the considered nonlinear differential equation.

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