2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/51845Thirty years ago, Coleman proved that no continuous symmetry is broken spontaneously in a two-dimensional relativistic quantum field theory. In his argument, however, it is difficult to understand the physical meaning of the assumption of no infrared divergence. I derive the same result directly from the cluster property of a local field regarded as a physically acceptable assumption.7 pages, no figures, corrected serious errorsHigh Energy Physics - TheoryStatistical MechanicsMathematical Physicstext