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Unprovable! Gödel in Lean

Unprovable! An interactive course on Gödel's incompleteness theorems, checked in Lean

Description excerpted from the original listing, which is linked below.

Open it Source code

Facts

Published: 29 Sep 2026 (20d ago)
Medium: web
Language: English (the page says so itself)
Subject: Learning (read from the page)
First seen: 29 Sep 2026, 22:17 UTC

Built with

Claude Code: confirmed
the agent's own trailer in the repository's commit history

What we can see

68 hygiene score

Certificate issued by YR1, 32 days remaining
Cookie attributes no cookies set
Credentials and payment does not ask for either
No strict transport security
Served over HTTPS
Mail authentication neither published
No insecure resources
Redirects none
Security headers 0 of 5 set
Third-party origins 2
Transport security TLS 1.3

Observed 29 Sep 2026 by fetching the page as a browser would. This describes hygiene and transparency, not safety: a missing header does not make a site dangerous, and a complete set does not make it trustworthy.

Made this?

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For a web page

<a href="https://bitsexplorer.com/i/1129819/unprovable-g-del-in-lean"><img src="https://bitsexplorer.com/badge/1129819.svg" alt="Featured on BitsExplorer" height="22"></a>

For a README (Markdown)

[![Featured on BitsExplorer](https://bitsexplorer.com/badge/1129819.svg)](https://bitsexplorer.com/i/1129819/unprovable-g-del-in-lean)

Changes we have seen

29 Sep 2026 first indexed

Unprovable! Gödel in Lean

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