Notas de Matemática - N° 169 http://www.saber.ula.ve/handle/123456789/4698 1997 2026-06-09T10:50:03Z Notas de Matemática http://www.saber.ula.ve/handle/123456789/22654 Notas de Matemática 2008-07-31T09:00:00Z On borel topologies over countable sets. http://www.saber.ula.ve/handle/123456789/22653 On borel topologies over countable sets. Uzcátegui Aylwin, Carlos Enrique 2006-05-31T09:00:00Z