A Lanczos-like method for non-autonomous linear ordinary differential equations

The time-ordered exponential is defined as the function that solves a system of coupled first-order linear differential equations with generally non-constant coefficients. In spite of being at the heart of much system dynamics, control theory, and model reduction problems, the time-ordered exponenti...

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Published inBollettino della Unione matematica italiana (2008) Vol. 16; no. 1; pp. 81 - 102
Main Authors Giscard, Pierre-Louis, Pozza, Stefano
Format Journal Article
LanguageEnglish
Published Cham Springer International Publishing 01.03.2023
Springer Nature B.V
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ISSN1972-6724
2198-2759
DOI10.1007/s40574-022-00328-6

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Abstract The time-ordered exponential is defined as the function that solves a system of coupled first-order linear differential equations with generally non-constant coefficients. In spite of being at the heart of much system dynamics, control theory, and model reduction problems, the time-ordered exponential function remains elusively difficult to evaluate. The ∗ -Lanczos algorithm is a (symbolic) algorithm capable of evaluating it by producing a tridiagonalization of the original differential system. In this paper, we explain how the ∗ -Lanczos algorithm is built from a generalization of Krylov subspaces, and we prove crucial properties, such as the matching moment property . A strategy for its numerical implementation is also outlined and will be subject of future investigation.
AbstractList The time-ordered exponential is defined as the function that solves a system of coupled first-order linear differential equations with generally non-constant coefficients. In spite of being at the heart of much system dynamics, control theory, and model reduction problems, the time-ordered exponential function remains elusively difficult to evaluate. The ∗ -Lanczos algorithm is a (symbolic) algorithm capable of evaluating it by producing a tridiagonalization of the original differential system. In this paper, we explain how the ∗ -Lanczos algorithm is built from a generalization of Krylov subspaces, and we prove crucial properties, such as the matching moment property . A strategy for its numerical implementation is also outlined and will be subject of future investigation.
The time-ordered exponential is defined as the function that solves a system of coupled first-order linear differential equations with generally non-constant coefficients. In spite of being at the heart of much system dynamics, control theory, and model reduction problems, the time-ordered exponential function remains elusively difficult to evaluate. The ∗-Lanczos algorithm is a (symbolic) algorithm capable of evaluating it by producing a tridiagonalization of the original differential system. In this paper, we explain how the ∗-Lanczos algorithm is built from a generalization of Krylov subspaces, and we prove crucial properties, such as the matching moment property. A strategy for its numerical implementation is also outlined and will be subject of future investigation.
Author Giscard, Pierre-Louis
Pozza, Stefano
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  surname: Pozza
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CitedBy_id crossref_primary_10_1007_s11075_022_01351_6
crossref_primary_10_1080_03081087_2024_2303058
crossref_primary_10_1016_j_jmaa_2024_129195
crossref_primary_10_1002_pamm_202200050
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Issue 1
Keywords Tridiagonal matrices
Matrix differential equations
Ordinary differential equations
Lanczos algorithm
Matching moments
Time-ordered exponential
Language English
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Snippet The time-ordered exponential is defined as the function that solves a system of coupled first-order linear differential equations with generally non-constant...
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SubjectTerms Algorithms
Control theory
Differential equations
Exponential functions
Mathematics
Mathematics and Statistics
Model reduction
Subspaces
System dynamics
Title A Lanczos-like method for non-autonomous linear ordinary differential equations
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