
The author studies oscillatory properties of solutions of selfadjoint linear differential equations of even order and their perturbations \[ \sum^n_{k= 0} (- 1)^k (p_k(x) y^{(k)})^{(k)}+ q(x) y= 0. \] His results generalize several known criteria for this type of equations.
perturbations, Linear ordinary differential equations and systems, oscillatory properties, selfadjoint linear differential equations of even order, Oscillation theory, zeros, disconjugacy and comparison theory for ordinary differential equations
perturbations, Linear ordinary differential equations and systems, oscillatory properties, selfadjoint linear differential equations of even order, Oscillation theory, zeros, disconjugacy and comparison theory for ordinary differential equations
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