Ouasti, Assia2020-03-012020-03-012019-06-17salle des thèsesMS-510-93-01https://dspace.univ-tlemcen.dz/handle/112/15451In this thesis, we are interested in a semi-linear ordinary differential equation with a neutral term and finite delay. The purpose of this work is to show that this equation is approximately controllable in finite time. The result is obtained by assuming that the linear part of the equation is approximately controllable. An example is given at the end of this study to illustrate its application.frSemi-group theory, Krasnoselskii fixed-point theorem, approximate controllability.Théorie des semi-groupes, théorème du point fixe de Krasnoselskii, contrôlabilité approchée.Thesis