Geodesic
Reducibility of linear differential systems to linear differential equations
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 3 (2019), pp. 39-44

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Lyapunov reducibility of any bounded and sometimes unbounded linear homogeneous differential system to some bounded linear homogeneous differential equation is established. The preservation of the additional property of periodicity of coefficients is guaranteed, and for two-dimensional or complex systems the constancy of their coefficients is preserved. The differences in feasibility of asymptotic and generalized Lyapunov reducibility from Lyapunov one are indicated. 
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     author = {I. N. Sergeev},
     title = {Reducibility of linear differential systems to linear differential equations},
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     url = {http://geodesic.mathdoc.fr/item/VMUMM_2019_3_a4/}
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I. N. Sergeev. Reducibility of linear differential systems to linear differential equations. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 3 (2019), pp. 39-44. http://geodesic.mathdoc.fr/item/VMUMM_2019_3_a4/