This study focuses on optimal feedback control for stochastic Caputo fractional evolution
systems in separable Hilbert spaces. Initially, we deal with the existence of a mild solution …

This article studies the approximate controllability for a class of fractional control system with
semigroup operators governed by differential equations with Hilfer fractional derivatives of …

This article discusses the approximate controllability of damped second-order neutral
differential equations with state-dependent delay. The results are obtained using strongly …

In this paper, we use Bohnenblust–Karlin's fixed point theorem and the theory of strongly
continuous cosine families of bounded linear operators to study the approximate …

In this article, we investigate the approximate controllability of damping second-order
stochastic differential systems with hemivariational inequalities. First, we show the existence …

In this paper, the approximate controllability problem is discussed for second-order neutral
differential inclusions with damping in Banach spaces. The study establishes the existence …

In this paper, we present a new Leibniz-type rule for two variants of the most generalized
fractional derivatives; the regularized ψ-Hilfer derivative and the (k, ψ)-Hilfer derivative. As a …

The primary aim of this article is to explore the approximate controllability of second-order
impulsive hemivariational inequalities with initial conditions in Hilbert space. The mild …

In this paper, we show the approximate controllability for a class of semilinear fractional
stochastic systems in abstract space with the Riemann–Liouville fractional derivative. The …