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The C-library cddlib can be used for the reverse operation (i.e. convex hull computation). This means that one can move back and forth between an inequality representation and a generator (i.e. vertex and ray) representation of a polyhedron with cddlib. Also, cddlib can solve a linear programming problem, i.e. a problem of maximizing and minimizing a linear function over P. From Dimitri Karamazov; ok rsadowski@