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Rectifiable oscillations of self-adjoint and damped linear differential equations of second-order. (English) Zbl 1223.34047
The authors study asymptotic and oscillatory properties near $x=0$ of all solutions of the self-adjoint linear differential equation $$(py')'+qy=0.$$ They give a characterization of the oscillatory behavior near $x=0$ by means of the nonintegrability of $\sqrt{q/p}$.

##### MSC:
 34C10 Qualitative theory of oscillations of ODE: zeros, disconjugacy and comparison theory 34A30 Linear ODE and systems, general
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##### References:
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