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## Effective Reducibility of Quasi-Periodic Linear Equations close to Constant Coefficients

### Abstract

Let us consider the differential equation $$\dot{x}=(A+\varepsilon Q(t,\varepsilon))x, \;\;\;\; |\varepsilon|\le\varepsilon_0,$$ where A is an elliptic constant matrix and Q depends on time in a quasi-periodic (and analytic) way. It is also assumed that the eigenvalues of A and the basic frequencies of Q satisfy a diophantine condition. Then it is proved that this system can be reduced to $$\dot{y}=(A^{*}(\varepsilon)+\varepsilon R^{*}(t,\varepsilon))y, \;\;\;\; |\varepsilon|\le\varepsilon_0,$$ where $R^{*}$ is exponentially small in $\varepsilon$, and the linear change of variables that performs such a reduction is also quasi-periodic with the same basic frequencies as Q. The results are illustrated and discussed in a practical example

Topics: Anàlisi global (Matemàtica), Global analysis (Mathematics)
Publisher: Society for Industrial and Applied Mathematics
Year: 2016
DOI identifier: 10.1137/S0036141095280967
OAI identifier: oai:diposit.ub.edu:2445/69315
Journal:

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