Toprakseven, Şuayip2025-07-182025-07-18202321481830https://hdl.handle.net/11494/5826This paper deals with a class of nonlinear fractional boundary value problems at resonance with Caputo-Fabrizio fractional derivative. We establish some new necessary conditions for the existence of positive solutions for the fractional boundary value problems at resonance by using the Leggett-Williams norm-type theorem for coincidences due to O’ Regan and Zima. Some examples are constructed to support our results.eninfo:eu-repo/semantics/openAccessFractional caputo-fabrizio differential equationNecessary conditionPositive solutionResonanceThe existence of positive solutions for the caputo-fabrizio fractional boundary value problems at resonanceArticle151717810.47000/tjmcs.1190935s2.0-85183887578Q4