Exponentiating $2\times2$ and $3\times3$ Matrices Done Right

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dc.creatorPopov, Angel P.
dc.creatorTodorov, Todor D.
dc.date2007-12-17
dc.date.accessioned2026-07-07T08:49:37Z
dc.date.available2026-07-07T08:49:37Z
dc.descriptionWe derive explicit formulas for calculating $e^A$, $\cosh{A}$, $\sinh{A}, \cos{A}$ and $\sin{A}$ for a given $2\times2$ matrix $A$. We also derive explicit formulas for $e^A$ for a given $3\times3$ matrix $A$. These formulas are expressed exclusively in terms of the characteristic roots of $A$ and involve neither the eigenvectors of $A$, nor the transition matrix associated with a particular canonical basis. We believe that our method has advantages (especially if applied by non-mathematicians or students) over the more conventional methods based on the choice of canonical bases. We support this point with several examples for solving first order linear systems of ordinary differential equations with constant coefficients.
dc.description17 pages
dc.identifierhttps://arxiv.org/abs/0712.2632
dc.identifierhttp://arxiv.org/abs/0712.2632
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/144362
dc.subjectHistory and Overview
dc.subject15A21, 15A18, 34A30
dc.titleExponentiating $2\times2$ and $3\times3$ Matrices Done Right
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