Díaz Díaz, Jesús IldefonsoHenry, J.Ramos del Olmo, Ángel Manuel2023-06-202023-06-201996Díaz,J.I.-Henry,J.-Ramos,A.M.: On the approximate controllability of some semilinear parabolic boundary value problems. Submitted for publication. Díaz,J.I.-Ramos,A.M.: Resultados positivos y negativos sobre la controlabilidad aproximada de problemas parabólicos semilineales; Proceedings of XIII C.E.D.Y.A./III Congreso de Matemática Aplicada. Univ. Politécnica of Madrid (1993). Fabre,C.-Puel,J.P.-Zuazua,E.: Contrôlabilité approchée de l'équation de la chaleur semi-linéaire; C. R. Acad. Sci. Paris, t. 315, Serie I, (1992), pp. 807-812. Henry,J.: Etude de la contrôlabilité de certaines équations paraboliques; Thèse d'Etat, (1978), Université Paris VI. Lions,J.L.: Remarques sur la contrôlabilité approchée; Proceedings of Jornadas Hispano-Francesas sobre Control de Sistemas Distribuidos. Universidad de Malaga, (1990), pp. 77-880044-2267https://hdl.handle.net/20.500.14352/574113rd International Congress on Industrial and Applied Mathematics (ICIAM 95)In this communication we develop and improve some of the results of [4] on the approximate controllability of several semilinear parabolic boundary value problems where the nonlinear term appears either at the second order parabolic equation or at the put boundary condition. We also distinguish the cases where the control function acts on the interior of the parabolic set Q := R x (0, T) from the one in which the control acts on the boundary Sigma := partial derivative Omega x (0, T). Most of our results will concern to control problems with final observation i.e. our goal is to prove that the set {y(T, : v)} generated by the value of solutions at time T is dense in L(2)(Omega) when v runs through the set of controls. Nevertheless we also consider a control problem with a boundary observation. In that case we shall prove that if Sigma(1) subset of Sigma then the set {y(.,.:v}/(Sigma 1)} generated by the trace of solutions on Sigma(1) is a dense subset of L(2)(Sigma(1)) when v runs through the set of controls.engjournal articlehttp://www.wiley-vch.de/publish/en/journals/alphabeticIndex/2233/?sID=ohf3hm8vncmhg6084oequmdlt2restricted access517.927Geometría diferencial1204.04 Geometría Diferencial