A retraction theorem for topological fundamental groups with application to the Hawaiian earring

2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/74150A characterization of regular topological fundamental groups yields a `no retraction theorem' for spaces constructed in similar fashion to the Hawaiian earring.4 pagesAlgebraic TopologyGeneral Topology54H11A retraction theorem for topological fundamental groups with application to the Hawaiian earringtext