RT Journal Article T1 Existence of positive solutions for nth-order periodic difference equations A1 Cabada Fernández, Alberto A1 Ferreiro Darriba, Juan Bosco K1 Periodic boundary value problem K1 nth order difference equations K1 Non-zero fixed point K1 Positive solutions AB This paper is devoted to the study of difference equations coupled with periodic boundary value conditions. We deduce the existence of at least one positive solution provided that the nonlinear part of the equation satis_es some monotonicity assumptions and the existence of a positive upper solution. The result is obtained from a new _xed point theorem based on the classical Krasnoselskii's cone expansion/contraction theorem and the constant sign properties of the related Green's function. PB Taylor & Francis YR 2011 FD 2011 LK https://hdl.handle.net/10347/39525 UL https://hdl.handle.net/10347/39525 LA eng NO Cabada, A., & Ferreiro, J. B. (2011). Existence of positive solutions for nth-order periodic difference equations. Journal of Difference Equations and Applications, 17(6), 935–954. https://doi.org/10.1080/10236190903460412 NO This is an Accepted Manuscript of an article published by Taylor & Francis in Journal of Difference Equations and Applications on 9 Mai 2011, available at: https://doi.org/10.1080/10236190903460412 NO This work has been partially supported by Ministerio de Educación y Ciencia, Spain, project MTM2007-61724, and by Xunta de Galicia, Spain, project PGIDIT06PXIB207023PR DS Minerva RD 23 abr 2026