The paper deals with the existence of positive solutions for a second-order multi-point boundary value problem at resonance
The key tool is the Leggett-Williams norm-type theorem for coincidence equations due to D. O’Regan and M. Zima [Arch. Math. 87, No. 3, 233–244 (2006; Zbl 1109.47051)].
Reviewer’s remark: There is a gap in the proof of one of the main results of the paper. Namely, the assumptions of Theorem 2 do not imply the condition (C2) of Lemma 2.1.