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Periodic solutions of nonlinear second-order difference equations. (English) Zbl 1098.39004
The existence of numerous particular cases solutions to the delay difference equation of the form $$y(t+2)+by(t+1)+cy(t)=f(y(t))$$ $$t=0,1, 2,3,\dots$$, where $$c\neq 0$$ and $$uf(u)>0$$ whenever $$|u|\geq\beta>0$$ and $$b$$ and $$c$$ are real constants and $$f$$ is a realvalued, continuous function is considered.

##### MSC:
 39A11 Stability of difference equations (MSC2000)
##### Keywords:
delay difference equation
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