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Periodic solutions of second-order nonlinear difference equations containing a small parameter. III: Perturbation theory. (English) Zbl 0592.39005
The paper is the continuation of two previous ones, concerning the same subject and by the same author [ibid. 316, 273-277 (1983; Zbl 0529.39002) and ibid. 320, 169-174 (1985; Zbl 0589.39004)]. Here the purpose is to construct first and second approximations to the solutions of the following class of nonlinear difference equations $x_{k+1}-(2 \cos \phi)x_ k+x_{k-1}=\epsilon f,$ where $$\phi$$ is a given constant; f is a polynomial function of $$(x_{k+1},x_ k,x_{k-1})$$; $$\epsilon$$ is a small positive parameter $$(0<\epsilon \ll 1)$$ and $$\{$$ $$k\}$$ is the set of positive integers. The techniques exploited are the perturbation techniques of the Lindstedt-Poincaré method.
Reviewer: V.C.Boffi

##### MSC:
 39A10 Additive difference equations
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##### References:
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