2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/135227In this note, we fill in a gap in the literature by proving that the Teichmueller modular groups (mapping class groups) are not Poincare duality groups and the complexes of curves of surfaces have infinite homotopy type (i.e. are not homotopy equivalent to a finite CW-complex).11 pages, no figuresGeometric TopologyGroup Theory32G15 (Primary); 20F38, 20J06, 30F60, 57M07, 57M99 (Secondary)text