%0 Generic %D 2009 %T Computing backwards with P systems %A Miguel A. Gutiérrez-Naranjo %A Mario J. Pérez-Jiménez %C Sevilla, España %I Fénix Editora %P 211-226 %U http://www.gcn.us.es/?q=node/414 %V I %X Searching all the configurations C ′ such that produce a given configuration C, or, in other words, computing backwards in Membrane Computing is an extremely hard task. The current approximations are based in heavy hand-made calculus by consid- ering the specific features of the given configuration. In this paper we present a general method for characterizing all the configurations C ′ such that produce a given configura- tion C in transition P systems without cooperation and without dissolution. %8 02/02/2009 %@ 978-84-613-2837-6