Dear Christophe, this message is just to let you know that the Parma Polyhedra Library now supports polyhedra bounded by a mixture of strict and non strict inequalities. The CVS version already contains a complete implementation, even though we are still working on it. We may be able to release the new version of the library in 3/4 weeks, but we can provide snapshots before that time. All the best Roberto -- Prof. Roberto Bagnara Computer Science Group Department of Mathematics, University of Parma, Italy http://www.cs.unipr.it/~bagnara/ mailto:bagnara@cs.unipr.it