Batool, A.Talib, I.Riaz, M.B.Tunç, C.2025-05-102025-05-1020222576-529910.1080/25765299.2022.21126462-s2.0-85136517057https://doi.org/10.1080/25765299.2022.2112646https://hdl.handle.net/20.500.14720/3064Our main concern in this study is to present the generalized results to investigate the existence of solutions to nonlinear fractional boundary value problems (FBVPs) with generalized nonlinear boundary conditions. The framework of the presented results relies on the lower and upper solutions approach which allows us to ensure the existence of solutions in a sector defined by well-ordered coupled lower and upper solutions. It is worth mentioning that the presented results unify the existence criteria of certain problems which were treated on a case-by-case basis in the literature. Two examples are supplied to support the results. © 2022 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group on behalf of the University of Bahrain.eninfo:eu-repo/semantics/openAccessAntiperiodic Boundary ConditionsCaputo Fractional DerivativeFractional Differential EquationsNonlinear Boundary ConditionsPeriodic Boundary ConditionsUpper And Lower SolutionsArticle291N/AQ2249256