Algebraic properties of phases of the differential equation $$y''=q(t)y$$.(English)Zbl 0423.34013

MSC:

 34A25 Analytical theory of ordinary differential equations: series, transformations, transforms, operational calculus, etc. 34A30 Linear ordinary differential equations and systems 34C99 Qualitative theory for ordinary differential equations
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References:

 [1] Borůvka O.: Lineare Differentialtransformationen 2. Ordnung. DVW, Berlin, 1967. · Zbl 0153.11201 [2] Rachůnková I.: On the theory of phases of academician O. Borůvka. Acta UPO, T. 45 (1974), 63-75. · Zbl 0319.34012 [3] Rachůnková I.: On algebraic properties of dispersions of the 3rd and 4th kind of the differential equation y” = q(t) y. Časopis pro pěst. mat., 100 (1975), 15-26. · Zbl 0302.34041
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