Coupled systems of nonlinear sequential proportional Hilfer-type fractional differential equations with multi-point boundary conditions

In this paper, we studied the existence of solutions for a coupled system of nonlinear sequential proportional psi-Hilfer fractional differential equations with multi -point boundary conditions. By using a Burton's version of the Krasnosel'skii's fixed-point theorem we established sufficient conditions for the existence result. An example illustrating our main result was also provided.