Investigation of Systems of Hilfer-Type Fractional Differential Equations

This chapter is concerned with the investigation of systems of nonlinear fractional differential equations containing Hilfer–Hadamard, Hilfer, Hilfer-type generalized proportional, Hilfer-type sequential, \(\psi \) -Hilfer sequential, \((k,\psi )\) -Hilfer, Hilfer and Riemann–Liouville mixed fractional differential operators subject to different boundary conditions such as two-point, nonlocal integral, multipoint, Riemann–Stieltjes integral multi-strip, and integro-multipoint boundary conditions.