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dc.contributor.authorCarlson, Tim
dc.date.accessioned2015-09-29T00:59:53Z
dc.date.available2015-09-29T00:59:53Z
dc.date.issued2005-05
dc.identifier.urihttp://hdl.handle.net/11122/6028
dc.descriptionThesis (M.S.) University of Alaska Fairbanks, 2005en_US
dc.description.abstractMagnus' expansion approximates the solution of a linear, nonconstant-coefficient system of ordinary differential equations (ODEs) as the exponential of an infinite series of integrals of commutators of the matrix-valued coefficient function. It generalizes a standard technique for solving first-order, scalar, linear ODEs. However, much about the convergence of Magnus' expansion and its efficient computation is not known. This thesis describes in detail the derivation of Magnus' expansion and reviews Iserles' ordering for efficient calculation. Convergence of the expansion is explored and known convergence estimates are applied. Finally, Magnus' expansion is applied to several numerical examples, keeping track of convergence as it depends on parameters. These examples demonstrate the failure of current convergence estimates to correctly account for the degree of commutativity of the matrix-valued coefficient function.en_US
dc.description.tableofcontentsIntroduction -- Motivation : systems arising from machining applications -- Geometric integration -- General theory of ordinary differential equations -- Existence and uniqueness of solutions -- Fundamental solutions -- Classical methods for approximating a fundamental solution Picard Iteration -- Hausdorff's equation -- Derivation of Hausdorff's equation for ... -- Solving the Linear Operator Equation ... Magnus' expansion -- Estimates for convergence of Magnus' expansion -- Examples -- The Mathieu example -- A non-commutative example -- A Frenet example -- Conclusions -- List of references -- Index.en_US
dc.language.isoen_USen_US
dc.titleMagnus' expansion as an approximation tool for ordinary differential equationsen_US
dc.typeThesisen_US
dc.type.degreemsen_US
dc.identifier.departmentDepartment of Mathematical Sciencesen_US
refterms.dateFOA2020-03-05T10:05:36Z


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