Geodesic
On the Existence and Stability of an Infinite-Dimensional Invariant Torus
Matematičeskie zametki, Tome 109 (2021) no. 4, pp. 508-528.

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We consider an annular set of the form $K=B\times \mathbb{T}^{\infty}$, where $B$ is a closed ball of the Banach space $E$, $\mathbb{T}^{\infty}$ is the infinite-dimensional torus (the direct product of a countable number of circles with the topology of coordinatewise uniform convergence). For a certain class of smooth maps $\Pi\colon K\to K$, we establish sufficient conditions for the existence and stability of an invariant toroidal manifold of the form $$ A=\{(v, \varphi)\in K: v=h(\varphi)\in E,\,\varphi\in\mathbb{T}^{\infty}\}, $$ where $h(\varphi)$ is a continuous function of the argument $\varphi\in\mathbb{T}^{\infty}$. We also study the question of the $C^m$-smoothness of this manifold for any natural $m$.
Keywords: mapping, infinite-dimensional invariant torus, stability, smoothness.
Mots-clés : annulus principle 
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S. D. Glyzin; A. Yu. Kolesov; N. Kh. Rozov. On the Existence and Stability of an Infinite-Dimensional Invariant Torus. Matematičeskie zametki, Tome 109 (2021) no. 4, pp. 508-528. http://geodesic.mathdoc.fr/item/MZM_2021_109_4_a2/

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