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Positive periodic solutions of nonlinear functional difference equations. (English) Zbl 1007.39005
The existence of multiple positive periodic solutions with the help of Krasnoselskij’s fixed point theorem of the nonlinear delay functional difference equation \[ x(n+ 1)= a(n) x(n)+ \lambda h(n)+(x(n- \tau(n)) \] is established.

MSC:
39A11 Stability of difference equations (MSC2000)
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