2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/32153Lambek's production machines may be used to generate and recognize sentences in a subset of the language described by a production grammar. We determine in this paper the subset of the language of a grammar generated and recognized by such machines.13 pages, 1 figureLogic in Computer ScienceF.1.1;F.4.2text