“…The authors recently discussed approximate controllability results for fractional stochastic evolution systems of order
with delay employing integrodifferential systems, fixed point theorem, Sobolev type, cosine and sine function operators, and the Wiener process in Reference 8. Very recently, in Reference
53, the authors proved the optimal control and approximate controllability results for fractional delay integrodifferential evolution equations
using cosine families, mild solution, continuous dependence, and fixed point theorem.…”