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# Coq
[![GitLab][gitlab-badge]][gitlab-link]
[![Azure Pipelines][azure-badge]][azure-link]
[![Gitter][gitter-badge]][gitter-link]
[![DOI][doi-badge]][doi-link]
[gitlab-badge]: https://gitlab.com/coq/coq/badges/master/pipeline.svg
[gitlab-link]: https://gitlab.com/coq/coq/commits/master
[azure-badge]: https://dev.azure.com/coq/coq/_apis/build/status/coq.coq?branchName=master
[azure-link]: https://dev.azure.com/coq/coq/_build/latest?definitionId=1?branchName=master
[gitter-badge]: https://badges.gitter.im/coq/coq.svg
[gitter-link]: https://gitter.im/coq/coq
[doi-badge]: https://zenodo.org/badge/DOI/10.5281/zenodo.1003420.svg
[doi-link]: https://doi.org/10.5281/zenodo.1003420
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.
## Installation
[![latest packaged version(s)][repology-badge]][repology-link]
[![Arch package][arch-badge]][arch-link]
[![Chocolatey package][chocolatey-badge]][chocolatey-link]
[![Homebrew package][homebrew-badge]][homebrew-link]
[![MacPorts package][macports-badge]][macports-link]
[![nixpkgs unstable package][nixpkgs-badge]][nixpkgs-link]
[repology-badge]: https://repology.org/badge/latest-versions/coq.svg
[repology-link]: https://repology.org/metapackage/coq/versions
[arch-badge]: https://repology.org/badge/version-for-repo/arch/coq.svg
[arch-link]: https://www.archlinux.org/packages/community/x86_64/coq/
[chocolatey-badge]: https://repology.org/badge/version-for-repo/chocolatey/coq.svg
[chocolatey-link]: https://chocolatey.org/packages/Coq
[homebrew-badge]: https://repology.org/badge/version-for-repo/homebrew/coq.svg
[homebrew-link]: https://formulae.brew.sh/formula/coq
[macports-badge]: https://repology.org/badge/version-for-repo/macports/coq.svg
[macports-link]: https://www.macports.org/ports.php?by=name&substr=coq
[nixpkgs-badge]: https://repology.org/badge/version-for-repo/nix_unstable/coq.svg
[nixpkgs-link]: https://nixos.org/nixos/packages.html#coq
Download the pre-built packages of the [latest release][] for Windows and macOS;
read the [help page][opam-using] on how to install Coq with OPAM;
or refer to the [`INSTALL`](INSTALL) file for the procedure to install from source.
[latest release]: https://github.com/coq/coq/releases/latest
[opam-using]: https://coq.inria.fr/opam/www/using.html
## Documentation
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.
## Changes
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
it carefully.
## Questions and discussion
We have a number of channels to reach the user community and the
development team:
- Our [Discourse forum](https://coq.discourse.group).
- Our mailing list, the [Coq-Club](https://sympa.inria.fr/sympa/info/coq-club).
- Our [Gitter channel][gitter-link], which is a good way to reach
developers for quick chat and development questions.
See also [coq.inria.fr/community](https://coq.inria.fr/community.html).
## 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.
## Contributing to Coq
Guidelines for contributing to Coq in various ways are listed in the [contributor's guide](CONTRIBUTING.md).
Information about the next release is at https://github.com/coq/coq/wiki/Release-Plan
## 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!
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