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On an algebraic structure of a group of phases. (English) Zbl 0388.34003

MSC:
34A30 Linear ordinary differential equations and systems
34C10 Oscillation theory, zeros, disconjugacy and comparison theory for ordinary differential equations
34C99 Qualitative theory for ordinary differential equations
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References:
[1] BORŮVKA O.: Linear Differential Transformations of the Second Order. The English Universities Press, London 1971. · Zbl 0218.34005
[2] NEUMAN F.: Construction of differential equations with coexisting periodic solutions. Bull. Inst. Pol. Jassy (Romania) 16 (20), 1970, 67-75. · Zbl 0267.34039
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