Sufficient conditions for the existence of at least one $T-$periodic solution of second order nonlinear functional difference equations are established. We allow $f$ to be at most linear, superlinear or sublinear in obtained results.
@article{108051, author = {Yuji Liu}, title = {Periodic solutions of second order nonlinear functional difference equations}, journal = {Archivum Mathematicum}, volume = {043}, year = {2007}, pages = {67-74}, zbl = {1164.39005}, mrnumber = {2310126}, language = {en}, url = {http://dml.mathdoc.fr/item/108051} }
Liu, Yuji. Periodic solutions of second order nonlinear functional difference equations. Archivum Mathematicum, Tome 043 (2007) pp. 67-74. http://gdmltest.u-ga.fr/item/108051/
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