2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/101934We summarize recent nonperturbative results obtained for the thermodynamics of an SU(2) and an SU(3) Yang-Mills theory being in its preconfining (magnetic) phase. We focus on an explanation of the involved concepts and derivations, and we avoid technical details.10 pages, 3 figures, v2: consequences arising from a change of the magnetic evolution equation rectifiedHigh Energy Physics - Theorytext