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Zbl 1009.34033
Došlý, Ondřej; Hilger, Stefan
A necessary and sufficient condition for oscillation of the Sturm-Liouville dynamic equation on time scales. (English)
[J] J. Comput. Appl. Math. 141, No.1-2, 147-158 (2002). ISSN 0377-0427

This is a very nice paper about oscillatory properties of the second-order dynamic equation $$( r(t)x^\Delta)^\Delta+c(t)x^\sigma=0 \tag{1}$$on an arbitrary time scale ${\bbfT}$. Equation (1) contains as special cases the well known second-order Sturm-Liouville differential $(\bbfT= \bbfR)$ and difference $(\bbfT= \bbfZ)$ equations. A necessary and sufficient condition for the oscillation of equation (1) is established by transforming equation (1) into a scalar trigonometric system (other terminology is a self-reciprocal system). The classification of (1) to be oscillatory/nonoscillatory makes sense, since the time scales Sturmian separation theorem holds for equation (1). The main tool for the proof is the time scales trigonometric transformation. This transformation preserves the oscillatory behavior of transformed systems and generalizes the corresponding continuous-time $(\bbfT= \bbfR)$ and discrete-time $(\bbfT= \bbfZ)$ trigonometric transformations (the latter one obtained by {\it M. Bohner} and the first author [J. Differ. equations 163, No. 1, 113-129 (2000; Zbl 0956.39011)]). A further oscillation criterion for equation (1) is obtained via the Riccati technique.\par This paper will be useful for researchers interested in (non)oscillatory behavior of differential, difference, and/or dynamic equations.
[Roman Hilscher (East Lansing)]

MSC 2000:: *34C10 Qualitative theory of oscillations of ODE: Zeros, etc.
34B24 Sturm-Liouville theory
39A10 Difference equations
39A11 Stability of difference equations
39A12 Discrete version of topics in analysis

Keywords: time scale; oscillation; trigonometric system; Riccati equation

Citations: Zbl 0956.39011

Cited in: Zbl 1228.34146

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