Cabada Fernández, AlbertoAleksic, SuzanaTomovic, Tatjana V.Dimitrijevic, Sladjana2026-01-142026-01-142019-08-17Cabada, A., Aleksić, S., Tomović, T.V. et al. Existence of Solutions of Nonlinear and Non-local Fractional Boundary Value Problems. Mediterr. J. Math. 16, 119 (2019). https://doi.org/10.1007/s00009-019-1388-91660-5446https://hdl.handle.net/10347/45153In this paper, we establish new results for non-local boundary value problems. In particular, we study a fractional differential equation where the associated integral equation has a kernel that is not bounded above and changes its sign, so that, the positive sign of the possible solutions is generally not ensured. We provide some examples which support the theory and illustrate the applicability of the obtained results.engFractional differential equationnon-local boundary value problempositive solutionCaputo’s fractional derivativeGreen’s functionjournal article10.1007/s00009-019-1388-91660-5454open access