Abstract
It is proved that among systems with almost periodic analytic coefficients (with an algebraic number as frequency base), there are systems which lose the property of reducibility on the boundary of some disk of values of the parameter.
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I. N. Blinov, “The reducibility of systems of linear differential equations with almost periodic coefficients,” Izv. Akad. Nauk SSSR, Ser. Matem.,31, No. 2, 349–354 (1967).
A. I. Markushevich, A Short Course in Analytic Function Theory [in Russian], Moscow (1961).
B. M. Levitan, Almost Periodic Functions [in Russian], Moscow (1953).
I. G. Malkin, The Theory of Motion Stability [in Russian], Moscow (1966).
V. I. Arnol'd, “Small denominators and problems concerning the stability of motion in classical and celestial mechanics,” Uspekhi Matem. Nauk,18, No. 6, 91–192 (1963).
V. M. Millionshchikov, “Proof of the existence of irregular systems of linear differential equations with almost periodic coefficients,” Dif. Uravneniya,4, No. 3, 391–396 (1968).
I. N. Blinov, “Loss of reducibility of systems with almost periodic coefficients due to the insufficiently rapid rate of decrease of Fourier coefficients or to a nonalgebraic frequency base,” Dif. Uravneniya,6, No. 2, 253–259 (1970).
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Translated from Matematicheskie Zametki, Vol. 8, No. 1, pp. 115–120, July, 1970.
In conclusion the author wishes to express his gratitude to L. B. Danilov and M. G. Rabinovich for their comments on this work and also to D. V. Anosov for his suggestions.
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Blinov, I.N. The loss of the property of reducibility by systems of linear differential equations with almost periodic coefficients. Mathematical Notes of the Academy of Sciences of the USSR 8, 534–537 (1970). https://doi.org/10.1007/BF01093448
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DOI: https://doi.org/10.1007/BF01093448