Geodesic
On solutions of three-dimensional systems describing the transition from an unstable equilibrium to a stable cycle
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 51 (2011) no. 4, pp. 620-630 Cet article a éte moissonné depuis la source Math-Net.Ru

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Given a three-dimensional dynamical system on the interval $t_0, the transition from the neighborhood of an unstable equilibrium to a stable limit cycle is studied. In the neighborhood of the equilibrium, the system is reduced to a normal form. The matrix of the linearized system is assumed to have a complex eigenvalue $\lambda=\varepsilon+i\beta$, with $\beta\gg\varepsilon>0$ and a real eigenvalue $\delta<0$ with $|\delta|\gg\varepsilon$. On the arbitrary interval $[t_0,+\infty)$, an approximate solution is sought as a polynomial $P_N(\varepsilon)$ in powers of the small parameter $\varepsilon$ with coefficients from Hölder function spaces. It is proved that there exist $\varepsilon_N$ and $C_N$ depending on the initial data such that, for $0<\varepsilon<\varepsilon_N$, the difference between the exact and approximate solutions does not exceed $C_{N^{\varepsilon^{N+1}}}$. 
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     title = {On solutions of three-dimensional systems describing the transition from an unstable equilibrium to a~stable cycle},
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S. E. Gorodetski; A. M. Ter-Krikorov. On solutions of three-dimensional systems describing the transition from an unstable equilibrium to a stable cycle. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 51 (2011) no. 4, pp. 620-630. http://geodesic.mathdoc.fr/item/ZVMMF_2011_51_4_a5/

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