2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/154465A unified viewpoint is presented in margin to the ``Work, dissipation and fluctuations in nonequilibrium physics'', Bruxelles 22-25 March, 2006, where the topics were discussed by various authors and it became clear the need that the very different viewpoints be consistently presented by their proponents.Latex RevtexStatistical Mechanicstext