Geodesic
Dependence on the initial moment of the measure of stability and instability of the zero solution
Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹûternye nauki, Tome 34 (2024) no. 1, pp. 80-90
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The recently introduced concepts of stability measures and instability measures of different types are studied: Lyapunov, Perron or upper-limit. These concepts allow a natural probabilistic interpretation, which shows the dependence of specific properties of solutions of a differential system, starting close to its zero solution, on arbitrarily small perturbations of the initial values of the Cauchy problem with a fixed initial moment. The work examines precisely the dependence of these measures on the initial moment. It has been proved that this dependence is completely absent for one-dimensional and autonomous systems, as well as for many types of stability or instability of linear systems. Moreover, it has been proved that the extreme values of the measures of stability or instability themselves are always invariant with respect to the choice of the initial moment. Finally, an example of a system is given for which this dependence, on the contrary, manifests itself to the maximum possible extent.
Keywords: differential system, Lyapunov stability, Perron stability, upper-limit stability, measure of stability
Mots-clés : initial moment 
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I. N. Sergeev. Dependence on the initial moment of the measure of stability and instability of the zero solution. Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹûternye nauki, Tome 34 (2024) no. 1, pp. 80-90. http://geodesic.mathdoc.fr/item/VUU_2024_34_1_a5/

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