We consider a second order nonlinear difference equation \[ \Delta ^2 y_n = a_n y_{n+1} + f(n,y_n,y_{n+1})\,,\quad n\in N\,. \qquad \mathrm {(\mbox{E})}\] The necessary conditions under which there exists a solution of equation (E) which can be written in the form \[ y_{n+1} = \alpha _{n}{u_n} + \beta _{n}{v_n}\,,\quad \mbox{are given.} \] Here $u$ and $v$ are two linearly independent solutions of equation \[ \Delta ^2 y_n = a_{n+1} y_{n+1}\,, \quad ({\lim \limits _{n \rightarrow \infty } \alpha _{n} = \alpha <\infty } \quad {\rm and} \quad {\lim \limits _{n \rightarrow \infty } \beta _{n} = \beta <\infty })\,. \] A special case of equation (E) is also considered.
@article{107967, author = {Ma\l gorzata Migda and Ewa Schmeidel and Ma\l gorzata Zb\k aszyniak}, title = {On the existence of solutions of some second order nonlinear difference equations}, journal = {Archivum Mathematicum}, volume = {041}, year = {2005}, pages = {379-388}, zbl = {1122.39001}, mrnumber = {2195491}, language = {en}, url = {http://dml.mathdoc.fr/item/107967} }
Migda, Małgorzata; Schmeidel, Ewa; Zbąszyniak, Małgorzata. On the existence of solutions of some second order nonlinear difference equations. Archivum Mathematicum, Tome 041 (2005) pp. 379-388. http://gdmltest.u-ga.fr/item/107967/
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