2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/21342This chapter reviews the theoretical description of interacting fermions in one dimension. The Luttinger liquid concept is elucidated using the Tomonaga-Luttinger model as well as integrable lattice models. Weakly coupled chains and attempts to experimentally verify the theoretical predictions are discussed.42 pages, 6 figures, minor style changes, to be published in "Interacting Electrons in Low Dimensions", Kluwer Academic Publishers (2003)Strongly Correlated Electronstext