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arXiv · 1510.00410

Floquet Theory for Second Order Linear Homogeneous Difference Equations

Andrés M. Encinas·M. José Jiménez
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Abstract

In this paper we provide a version of the Floquet's theorem to be applied to any second order difference equations with quasi-periodic coefficients. To do this we extend to second order linear difference equations with quasi-periodic coefficients, the known equivalence between the Chebyshev equations and the second order linear difference equations with constant coefficients. So, any second order linear difference equations with quasi-periodic coefficients is essentially equivalent to a Chebyshev equation, whose parameter only depends on the values of the quasi-periodic coefficients and can be determined by a non-linear recurrence. Moreover, we solve this recurrence and obtaining a closed expression for this parameter. As a by-product we also obtain a Floquet's type result; that is, the necessary and sufficient condition for the equation has quasi-periodic solutions.

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Andrés M. Encinas, M. José Jiménez. 2015-09-25. Floquet Theory for Second Order Linear Homogeneous Difference Equations. https://doi.org/10.1080/10236198.2015.1100609

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