Logistics Date & Time: Wednesday 17th June at 12:00 CEST (local time) URL: https://meet.jit.si/WEH2026-js-testing Notes: https://github.com/Igalia/webengineshackfest/wiki/2026-Beyond-testing-and-ty...

fast-check is a Property-based Testing framework for JavaScript and TypeScript. It works with Jest, Mocha, Vitest, and others. Let's fuzz!

Web Platform community event for people working on the different engines (Chromium/Blink/V8, Safari/WebKit/JSC, Firefox/Gecko/SpiderMonkey, Servo, Ladybird), on the testing side (WPT, Test262), on…

In this video, I demonstrate how an AI agent can be used to help check if a body of Lean code (intended for upstreaming to Mathlib) can be "golfed" (streamlined in presentation), and aligned with the…

18th International Symposium on Functional and Logic Programming

In this post, we show that property-based testing (PBT) is surprisingly effective for validating LLM-synthesised specifications of Lean programs: it is a cheap alternative to symbolic proofs, which he...

This document exists to help readers better understand Lean's kernel, clarify the trust assumptions involved in using Lean, and serve as a resource for those who wish to write their own external type…

Leonardo de Moura — Creator of Lean and Z3

A simple shared sandbox using unshare+nsenter.

A workshop for the Lean community - Thursday, March 12, 2026

Recently, the application of AI tools to Erdos problems passed a milestone: an Erdos problem (#728 https://www.erdosproblems.com/728) was solved more or less autonomously by AI (after some feedback…

A meeting all about Lean

My site: https://natebjones.com Full Story w/ Self-Audit Framework:…

The various HTTP response-generating functions (response/output, response/full, and response/xexpr) currently require one to provide a status message, with #"Okay" serving as a default. S...

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I started out updating the library to 4.23.0, but I immediately realized the library wasn't finished. I didn't quite realize how much code it would be, so this is a bit of a monster pull re...

Json Schema lean implementation. Contribute to CAIMEOX/json-schema-lean development by creating an account on GitHub.

A workshop for the Lean community - Thursday, March 12, 2026

Over at the Erdos problem website, AI assistance is now becoming routine. Here is what happened recently regarding Erdos problem #367 https://www.erdosproblems.com/367 : 1. On Nov 20, Wouter van…

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Leaning In! is a one-day workshop dedicated to the Lean programming language and proof assistant.

If you’re a hacker you may well have a passing interest in math, and if you have an interest in math you might like to hear about the direction of mathematical research. In a talk on this top…

The Mathlib Initiative supports the development of mathematical libraries in the Lean theorem prover.

Axioms are postulated constants. While the axiom's type must itself be a type (that is, it must have type Sort u), there are no further requirements. Axioms do not reduce to other terms.

plasTeX plugin to build formalization blueprints. Contribute to PatrickMassot/leanblueprint development by creating an account on GitHub.

The history of every major galactic civilization tends to pass through three distinct and recognizable phases, those of Survival, Inquiry and Sophistication, otherwise known as the How, Why, and Wh…

😎Here's a cool little field report from a Y Combinator hackathon event where they put Ralph Wiggum to the test. "We Put a Coding Agent in a While Loop and It Shipped 6 Repos Overnight"…

Transform your development workflow with Claude Code, the most advanced AI coding assistant powered by Claude Opus 4.1 and Claude Sonnet 4.5.

Welcome to the website of the SPLASH 2026 conference. We are working hard to fill the website with all related information. Please check back soon! In the meantime, please consider this overview of th...

Lean Workshop at Interactive Theorem Proving 2025 - 2 October 2025, Reykjavik, Iceland