Geodesic
Positive periodic solutions of nonlinear functional difference equations
Electronic journal of differential equations, Tome 2002 (2002)
In this paper, we apply a cone theoretic fixed point theorem to obtain sufficient conditions for the existence of multiple positive periodic solutions to the nonlinear functional difference equations

$ x(n+1)=a(n)x(n)\pm \lambda h(n) f(x(n-\tau(n))). $

Classification : 39A10, 39A12
Keywords: cone theory, positive, periodic, functional difference equations 
@article{EJDE_2002__2002__a173,
     author = {Raffoul,  Youssef N.},
     title = {Positive periodic solutions of nonlinear functional difference equations},
     journal = {Electronic journal of differential equations},
     year = {2002},
     volume = {2002},
     zbl = {1007.39005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2002__2002__a173/}
}
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Raffoul,  Youssef N. Positive periodic solutions of nonlinear functional difference equations. Electronic journal of differential equations, Tome 2002 (2002). http://geodesic.mathdoc.fr/item/EJDE_2002__2002__a173/