2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/41106These lectures give an introduction to thermal perturbation theory, hard thermal loops, and their use in a nonperturbative, approximately self-consistent resummation of the thermodynamical potentials of quantum chromodynamics.26 pages, 3 figures. Lectures given at the NATO Advanced Study Institute ``QCD perspectives on hot and dense matter'', August 6-18, 2001, in Cargèse, Corsica, FranceHigh Energy Physics - Phenomenologytext