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Trudy Instituta Matematiki i Mekhaniki UrO RAN, 2020, Volume 26, Number 3, Pages 84–90
DOI: https://doi.org/10.21538/0134-4889-2020-26-3-84-90
(Mi timm1747)
 

Refinement of estimates for the Lyapunov exponents of a class of linear nonautonomous systems of difference equations

A. V. Lasunsky

Yaroslav-the-Wise Novgorod State University
References:
Abstract: We obtain an estimate for the norm of an $n$th-order square matrix $A^{t}$:
$$ \|A^{t}\|\leq \sum^{n-1}_{k=0}C^{k}_{t}\gamma^{t-k}(\gamma+\|A\|)^{k},\quad t\geq n-1, $$
where $C^{k}_{t}$ are the binomial coefficients, $\gamma=\max\limits_{i}|\lambda_{i}|$, and $\lambda_{i}$ are the eigenvalues of $A$. Based on this estimate and using the freezing method, we improve the constants in the upper and lower estimates for the highest and lowest exponents, respectively, of the system $ x(t+1)=A(t)x(t),\ x\in \mathbb R^{n},\ t\in \mathbb Z^{+}, $ with a completely bounded matrix $A(t)$. It is assumed that the matrices $A(t)$ and $A^{-1} (t)$ satisfy the inequalities $ \|A(t)-A(s)\|\leq\delta|t-s|^{\alpha},\ \|A^{-1}(t)-A^{-1}(s)\|\leq\delta|t-s|^{\alpha} $ with some constants $0<\alpha\leq 1$ and $\delta>0$ for any $t,s\in\mathbb Z^{+}$. We give an example showing that the constants $\gamma$ and $\delta$ are generally related.
Keywords: estimates for Lyapunov exponents, freezing method for discrete systems.
Received: 28.04.2020
Revised: 16.05.2020
Accepted: 30.06.2020
Bibliographic databases:
Document Type: Article
UDC: 517.925.51
MSC: 39A30, 39A22
Language: Russian
Citation: A. V. Lasunsky, “Refinement of estimates for the Lyapunov exponents of a class of linear nonautonomous systems of difference equations”, Trudy Inst. Mat. i Mekh. UrO RAN, 26, no. 3, 2020, 84–90
Citation in format AMSBIB
\Bibitem{Las20}
\by A.~V.~Lasunsky
\paper Refinement of estimates for the Lyapunov exponents of a class of linear nonautonomous systems of difference equations
\serial Trudy Inst. Mat. i Mekh. UrO RAN
\yr 2020
\vol 26
\issue 3
\pages 84--90
\mathnet{http://mi.mathnet.ru/timm1747}
\crossref{https://doi.org/10.21538/0134-4889-2020-26-3-84-90}
\elib{https://elibrary.ru/item.asp?id=43893865}
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