Yves moinard About the computation of forgetting symbols and literals , NMR 2006 ( 11th Workshop on Non-monotonic Reasoning) , Institut für Informatik, Technische Universität Clausthal, Germany (http://cig.in.tu-clausthal.de/) , Lake District , 209--217 , june , 2006 , Document Abstract Recently, the old logical notion of forgetting propositional symbols (or reducing the logical vocabulary) has been generalized to a new notion: forgetting literals. The aim was to help the automatic computation of various formalisms which are currently used in knowledge representation, particularly for nonmonotonic reasoning. We develop here a further generalization, allowing propositional symbols to vary while forgetting literals. We describe the new notion, on the syntactical and the semantical side. We provide various manipulations over the basic definitions involved, including for the original version, which hopefully should help improving again the efficiency of the computation. This work concerns especially circumscription, since it is known that one way of computing circumscription uses the forgetting of literals. This web site is maintained by René Quiniou using the Weave system from the Caravel project: http://www-caravel.inria.fr. Last modification: 10-07-2011 09:54:25