Geodesic
Oscillation, rotatability, and wandering characteristic indicators for differential systems determining rotations of plane
Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (2019), pp. 21-26 
I. N. Sergeev. Oscillation, rotatability, and wandering characteristic indicators for differential systems determining rotations of plane. Vestnik Moskovskogo universiteta. Matematika, mehanika, no. 1 (2019), pp. 21-26. http://geodesic.mathdoc.fr/item/VMUMM_2019_1_a3/
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Voir la notice de l'article provenant de la source Math-Net.Ru

The oscillation, rotatability, and wandering characteristic indicators of Lyapunov type are studied for two-dimensional linear homogeneous differential systems that determine rotations of the phase plane. A complete set of order relations between them is obtained. For each of those indicators it is established whether it is continuous or discontinuous as a function of the coefficient of the system.

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[9] Sergeev I. N., “Oscillation, rotation, and wandering of solutions to linear differential systems”, J. Math. Sci., 230:5 (2018), 770–774 | DOI | MR | Zbl