Aimene, Djihad2021-04-052021-04-05202015628353https://dspace.univ-boumerdes.dz/handle/123456789/6763In this paper we apply a fixed-point theorem to study the existence and uniqueness of a mild solution and the approximate controllability of a fractional order impulsive differential equation with deviated argument in Hilbert spaces. An example is provided to show the effectiveness of the theoryenControllabilityDeviated argumentsDifferential equations with impulsesFixed-point theoremsFractional derivatives and integralsSemigroup theoryOn approximate controllability of impulsive fractional semilinear systems with deviated argument in hilbert spacesArticle