Strongly Exponentially Separated Linear Systems

In the study of linear differential systems, an important concept is that of exponential separation. It is closely related to the concept of exponential dichotomy and has played a key role in the theory of Lyapunov exponents. Usually in the study of exponential separation, it is assumed that the coe...

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Bibliographic Details
Published inJournal of dynamics and differential equations Vol. 31; no. 2; pp. 573 - 600
Main Authors Battelli, Flaviano, Palmer, Kenneth J.
Format Journal Article
LanguageEnglish
Published New York Springer US 01.06.2019
Springer Nature B.V
Subjects
Applications of Mathematics
Hamiltonian functions
Liapunov exponents
Linear systems
Mathematics
Mathematics and Statistics
Ordinary Differential Equations
Partial Differential Equations
Separation
Subspaces
34C25
Exponential separation
Exponential dichotomy
Symplectic matrices
Iwasawa decomposition
34D05
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Summary:In the study of linear differential systems, an important concept is that of exponential separation. It is closely related to the concept of exponential dichotomy and has played a key role in the theory of Lyapunov exponents. Usually in the study of exponential separation, it is assumed that the coefficient matrix A ( t ) is bounded in norm. Our first aim here is to develop a theory of exponential separation which applies to unbounded systems. It turns that in order to have a reasonable theory it is necessary to add the assumption that the angle between the two separated subspaces is bounded below (note this follows automatically for bounded systems). Our second aim is to show that if a bounded linear Hamiltonian system is exponentially separated into two subspaces of the same dimension, then it must have an exponential dichotomy.
ISSN:1040-7294
1572-9222
DOI:10.1007/s10884-018-9695-6