  A non-convex control system governed by a nonlinear impulsive evolution
equation of Hilfer fractional order in a Banach space is considered. The
existence of admissible state-control pair is established. Then the
introduction of suitable measure-valued control convexifies the system, and the
relaxed system is obtained. Further, the relaxation theorem for the described
class is proved along with the existence of optimal relaxed control.
