This is a web version of Lean 4. The official lean playground is hosted at live.lean-lang.org, while lean.math.hhu.de hosts a development server testing newer features.
In contrast to the Lean 3 web editor, in this web editor, the Lean server is running on a web server, and not in the browser.
If you experience any problems, or have feature requests, please open an issue here! PRs are welcome as well.
- User Manual: Specification of
lean4webfeatures for the end user. - Installation: Instructions to install your own instance of
lean4webon your own server - Development: Instructions to contribute to
lean4webitself