2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/186937We construct all instantons in the \nlsig\ on a cylindrical space-time, known not to exist on a finite time interval. The scale parameter, $ρ$, is related to the boundary condition in time. This may cure the $ρ\rightarrow0$ divergent instanton gas, through a proper inclusion of in and out states in the path integral.References added and corrected. Contribution to Lattice'94, 27 Sep - 1 Oct 1994, Bielefeld, Germany. 3 pages PostScript, uuencoded compressedHigh Energy Physics - Latticetext