An introduction to difference equations
An introduction to difference equations
A new view of the lp-theory for a system of higher order difference equations
Computers & Mathematics with Applications
Existence of periodic solutions in a linear higher order system of difference equations
Computers & Mathematics with Applications
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In this paper we give easily verifiable, but sharp (in most cases necessary and sufficient) algebraic conditions for the solutions of systems of higher order linear difference equations to be periodic. The main tool in our investigation is a transformation, recently introduced by the authors, which formulates a given higher order recursion as a first order difference equation in the phase space. The periodicity conditions are formulated in terms of the so-called companion matrices and the coefficients of the given higher order equation, as well.