2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/126872Nonlinear semi-discrete equations of the form t_x(n+1)=f(t(n), t(n+1), t_x(n)) are studied. An adequate algebraic formulation of the Darboux integrability is discussed and the attempt to adopt this notion to the classification of Darboux integrable chains has been undertaken.18 pagesExactly Solvable and Integrable Systemstext