2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/58934We consider endomorphism actions of arbitrary discrete semigroups on a connected metrizable topological group G. We give necessary and sufficient conditions for expansiveness of such actions when G is a Lie group or a compact finite-dimensional group.21 pages, no figuresDynamical Systems37C85text