Boundary controllability of Riemann-Liouville fractional semilinear equations

We study the boundary regional controllability of a class of Riemann-Liouville fractional semilinear sub -diffusion systems with boundary Neumann conditions. The result is obtained by using semi -group theory, the fractional Hilbert uniqueness method, and Schauder's fixed point theorem. Conditions on the order of the derivative, internal region, and on the nonlinear part are obtained. Furthermore, we present appropriate sufficient conditions for the considered fractional system to be regionally controllable and, therefore, boundary regionally controllable. An example of a population density system with diffusion is given to illustrate the obtained theoretical results. Numerical simulations show that the proposed method provides satisfying results regarding two cases of the control operator.