2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/155607The implications of the original misunderstanding of the etymology of the word "ergodic" are discussed, and the contents of a not too well known paper by Boltzmann are critically examined. The connection with the modern theory of Ruelle is attempted11 pages; e-mail gallavotti@roma1.infn.itChaotic Dynamicstext