Terms of Use

Last updated: June 2026

Educational content

Lean 4 Dev publishes educational content about Lean 4 programming and theorem proving. The material is provided for learning and reference. It is not a substitute for official Lean documentation, professional software review, or academic advice.

Acceptable use

• Use the site for learning, teaching, and research.
• Do not attempt to disrupt, scrape abusively, or attack the site.
• Do not submit malicious code, spam, or private credentials through contact channels.

Accuracy

Lean and Mathlib change over time. The site aims to keep examples useful, but code snippets may need adjustment for future Lean or Mathlib versions. Corrections can be sent through the contact page.

Intellectual property

The Lean name, Lean project, and Mathlib belong to their respective communities and rights holders. Lean 4 Dev is independent and is not officially affiliated with the Lean FRO.

Code examples on the site are intended for learning and adaptation unless a specific page states otherwise.

Advertising

The site may display advertising to support hosting and maintenance. Advertising does not imply endorsement by Lean 4 Dev, and editorial content is not controlled by advertisers.

No warranty

The site is provided on an as-is and as-available basis. Lean 4 Dev does not warrant that every example will be error-free, uninterrupted, or suitable for every use case.

Contact

Questions about these terms can be sent to [email protected].

See also the Privacy Policy and Editorial Policy.