Domain Patrick Cousot2,3 , Radhia Cousot1,3 , and Laurent Mauborgne3,4 1 Centre National de la Recherche Scientifique 2 Courant Institute of Mathematical Sciences, New York University 3 ´Ecole Normale Sup´erieure, Paris 4 Instituto Madrile˜no de Estudios Avanzados, Madrid Dedicated to the memory of Amir Pnueli