Positive solutions for a system of fractional integral boundary value problems involving Hadamard-type fractional derivatives (Q2336025)

Summary: In this paper, we use fixed-point index to study the existence of positive solutions for a system of Hadamard fractional integral boundary value problems involving nonnegative nonlinearities. By virtue of integral-type Jensen inequalities, some appropriate concave and convex functions are used to depict the coupling behaviors for our nonlinearities \(f_i (i = 1, 2)\).