ON APPROXIMATE CONTROLLABILITY FOR SYSTEMS OF FRACTIONAL EVOLUTION HEMIVARIATIONAL INEQUALITIES WITH RIEMANN-LIOUVILLE FRACTIONAL DERIVATIVES.

In this paper, we deal with the control systems governed by the systems of fractional evolution hemivariational inequalities involving Riemann-Liouville fractional derivatives. We establish suitable sufficient conditions to guarantee the existence of mild solutions. Under these conditions, the approximate controllability of the associated fractional evolution systems involving Riemann-Liouville fractional derivatives is formulated and proved. [ABSTRACT FROM AUTHOR]