Project Team Proval

Overall Objectives
Scientific Foundations
Application Domains
New Results
Contracts and Grants with Industry
Partnerships and Cooperations
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Section: Software

The Why3 system

Participants : Jean-Christophe Filliâtre [contact] , François Bobot, Claude Marché, Guillaume Melquiond, Andrei Paskevich.

Criteria for Software Self-Assessment: A-3-up, SO-4, SM-4, EM-4, SDL-4, OC-4.

Why3 is the next generation of Why. Why3 clearly separates the purely logical specification part from generation of verification conditions for programs. It features a rich library of proof task transformations that can be chained to produce a suitable input for a large set of theorem provers, including SMT solvers, TPTP provers, as well as interactive proof assistants.

It is distributed as open source, under GPL license, at .

Why3 is used as back-end of our own tools Krakatoa and Jessie, but also as back-end of the GNATprove tool (Adacore company), and in a near future of the WP plugin of Frama-C. Why3 has been used to develop and prove a significant part of the programs of our team gallery , and will be used soon for teaching (Master Parisien de Recherche en Informatique).