On Concepts of Controllability for Deterministic and Stochastic Systems
SIAM Journal on Control and Optimization
Approximate controllability of semilinear partial functional differential systems
Journal of Dynamical and Control Systems
Computers & Mathematics with Applications
Approximate controllability of fractional stochastic evolution equations
Computers & Mathematics with Applications
On the approximate controllability of fractional evolution equations with compact analytic semigroup
Journal of Computational and Applied Mathematics
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Fractional differential equations have wide applications in science and engineering. In this paper, we consider a class of control systems governed by the semilinear fractional differential equations in Hilbert spaces. By using the semigroup theory, the fractional power theory and fixed point strategy, a new set of sufficient conditions are formulated which guarantees the approximate controllability of semilinear fractional differential systems. The results are established under the assumption that the associated linear system is approximately controllable. Further, we extend the result to study the approximate controllability of fractional systems with nonlocal conditions. An example is provided to illustrate the application of the obtained theory.