## Conjugate points of solutions of an iterated differential equation of the $$n$$-th order.(English)Zbl 0545.34025

The author is concerned with a spacing of null points of oscillatory bands of solutions of an iterated linear differential equation of the n- th order. He introduces the notion of the n-th conjugate point as well as the notion of weakly and strongly conjugate points. He describes the properties of them and uses them for a description of the spacing of null points of an iterated equation.
Reviewer: M.Greguš

### MSC:

 34C05 Topological structure of integral curves, singular points, limit cycles of ordinary differential equations 34A30 Linear ordinary differential equations and systems
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### References:

 [1] Vlček V.: The first conjugate point of solution of the N-th order iterated differential equation. Acta UP Olom., F. R. N., Tom 73, 1982. · Zbl 0522.34029 [2] Borůvka O.: Lineare Differentialtransformationen 2. Ordnung. VEB Deutscher Verlag der Wissenschaften, Berlin, 1967. · Zbl 0153.11201 [3] Sherman T. L.: Properties of solutions of Nth order linear differential equations. Pacific J. Math., Vol. 15, No. 3, 1965. · Zbl 0132.31204 [4] Vlček V.: Conjugate points of solutions of a fourth-order iterated linear differential equation. Acta UP Olom., F. R. N., Tom 53, 1977. [5] Vlček V.: On a distribution of zeros of solutions of a fourth-order iterated linear differential equation. Acta UP Olom., F. R. N., Tom 57, 1978.
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