AuthorsFrançois Bobot, Jean-Christophe Filliâtre, Claude Marché, Guillaume Melquiond and Andrei Paskevich
LicenseGNU Lesser General Public License version 2.1
Tagsdeductive, program verification, formal specification, automated theorem prover and interactive theorem prover
Optional dependencies
Availableocaml-version < "4.06.0"
PublishedMay 6, 2014
Source [http] https://gforge.inria.fr/frs/download.php/33490/why3-0.83.tar.gz
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Why3 is a platform for deductive program verification.

It provides a rich language for specification and programming, called WhyML, and relies on external theorem provers, both automated and interactive, to discharge verification conditions. Why3 comes with a standard library of logical theories (integer and real arithmetic, Boolean operations, sets and maps, etc.) and basic programming data structures (arrays, queues, hash tables, etc.). A user can write WhyML programs directly and get correct-by-construction OCaml programs through an automated extraction mechanism. WhyML is also used as an intermediate language for the verification of C, Java, or Ada programs.

Why3 is a complete reimplementation of the former Why platform. Among the new features are: numerous extensions to the input language, a new architecture for calling external provers, and a well-designed API, allowing to use Why3 as a software library. An important emphasis is put on modularity and genericity, giving the end user a possibility to easily reuse Why3 formalizations or to add support for a new external prover if wanted.