Coq is a formal proof management system. It provides a formal language to write
mathematical definitions, executable algorithms and theorems together with an
environment for semi-interactive development of machine-checked proofs.
Download the pre-built packages of the [latest release](https://github.com/coq/coq/releases/latest) for Windows and MacOS;
read the [help page](https://coq.inria.fr/opam/www/using.html) on how to install Coq with OPAM;
or refer to the [`INSTALL` file](INSTALL) for the procedure to install from source.
The sources of the documentation can be found in directory [`doc`](doc).
See [`doc/README.md`](/doc/README.md) to learn more about the documentation,
in particular how to build it. The
documentation of the last released version is available on the Coq
web site at [coq.inria.fr/documentation](http://coq.inria.fr/documentation).
See also [Cocorico](https://github.com/coq/coq/wiki) (the Coq wiki),
and the [Coq FAQ](https://github.com/coq/coq/wiki/The-Coq-FAQ),
for additional user-contributed documentation.
There is a file named [`CHANGES.md`](CHANGES.md) that explains the differences and the
incompatibilities since last versions. If you upgrade Coq, please read
## The Coq Club
The Coq Club moderated mailing list is meant to be a standard way
to discuss questions about the Coq system and related topics. The
subscription link can be found at [coq.inria.fr/community](http://coq.inria.fr/community).
The topics to be discussed in the club should include:
* technical problems;
* questions about proof developments;
* suggestions and questions about the implementation;
* announcements of proofs;
* theoretical questions about typed lambda-calculi which are
closely related to Coq.
## Bugs report
Please report any bug / feature request in [our issue tracker](https://github.com/coq/coq/issues).
To be effective, bug reports should mention the OCaml version used
to compile and run Coq, the Coq version (`coqtop -v`), the configuration
used, and include a complete source example leading to the bug.
Guidelines for contributing to Coq in various ways are listed in the [contributor's guide](CONTRIBUTING.md).
## Supporting Coq
Help the Coq community grow and prosper by becoming a sponsor! The [Coq
Consortium](https://coq.inria.fr/consortium) can establish sponsorship contracts
or receive donations. If you want to take an active role in shaping Coq's
future, you can also become a Consortium member. If you are interested, please
get in touch!