2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49979We manifestly verify that the miraculous cancellation of the infrared divergence of the topologically massive Yang-Mills theory in the Landau gauge is completely determined by a new vector symmetry existing in its large topological mass limit, the Chern-Simons theory. Furthermore, we show that the cancellation theorem proposed by Pisarski and Rao is an inevitable consequence of this new vector symmetry.11 pages, RevTex, No figuresHigh Energy Physics - Theorytext