Qn pseudo-isotopy classes of homeomorphisms of #, (s ’ x Sn).

We study self-homotopy equivalences and diffeomorphisms of the (n + 1)-dimensional manifold x = #, (Sí x t) for any n =3. Then wecompletely determine the group of pseudo-isotopy classes of homeomorphisms of X and extend to dimension n well—known theorems due to F. Laudenbach and y. Poenaru [10],[12]and 3M. Montesinos ¡14].