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Periodic solutions to nonautonomous difference equations. (English) Zbl 0712.39014
The equation $$x_{n+1}=f_ n(x_ n)$$, $$n=0,1,..$$. with $$f_{n+T}(x)=f_ n(x)$$ for all n is discussed. A special class C of functions is introduced for which a periodic solution of the equation exists and also the asymptotics of all other solutions can be characterized.
The second part of the paper analyses in detail the equation $$x_{n+1}=a_ nx_ n/(1+b_ nx_ n),$$ with $$a_ n,b_ n$$ positive, bounded and periodic of integer period T, which belongs to the described class for $$a_ n>1$$. The relevance of these results to some models in mathematical biology is discussed.
Reviewer: J.Gregor

##### MSC:
 39A10 Additive difference equations 39A11 Stability of difference equations (MSC2000) 92B05 General biology and biomathematics
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##### References:
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