2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/63206Withdrawn paper because the results are published in math.AT/0308054 and math.AT/0308063.See math.AT/0308054 and math.AT/0308063Algebraic TopologyCategory Theory55P99;68Q85A Convenient Category for The Homotopy Theory of Concurrencytext