Lean
@leanprover
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Lean is a dependently-typed programming language and theorem prover.
Seattle
Joined April 2018
Another fantastic #LeanLang post by Dan Abramov!.
Beyond booleans. ~ Dan Abramov. #ITP #LeanProver.
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RT @Jose_A_Alonso: The Infinity Project (How to use AI and mathematics to prove and improve science and security). ~ Patrick Shafto. https:….
ifp.org
How to use AI and mathematics to prove and improve science and security
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🎉 Lean 4.22.0 is here! This marks the culmination of our Year 2 roadmap. Two major highlights:. 🧠 grind tactic: New SMT-style automated reasoning with theory-specific solvers and Gröbner basis support. 🏗️ New compiler: Closes long-standing issues and sets the foundation for
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RT @msmathcomp: The first #illustratingMath talk at the @ICERM today is by Florent Schaffhauser from @UniHeidelberg, speaking about "Algebr….
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RT @intmaxIO: At INTMAX, ."trust" isn't a hope;. it's a mathematical guarantee. Our core protocol logic is mechanically verified using th….
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RT @AlexKontorovich: LLM + Lean @leanprover + Open Source = ❤️. Congrats to @chijinML @prfsanjeevarora and the rest of the Goedel Prover te….
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Just saw this post on LinkedIn about a new #DiscreteMath game on the #LeanLang Game Server. The author, Shrey Vivek, won a "Best Poster" award at the SPMS Odyssey Research Symposium. 🎉. Try the Discrete Math game: Check out the LinkedIn post:.
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Thorsten Altenkirch delivers an excellent explanation of Gödel's Incompleteness Theorem on @Computerphile, including demonstrations with #LeanLang definitions!.
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RT @AlexKontorovich: Congratulations to Jeremy Avigad, who will be the inaugural Director of a new NSF-funded Institute for Computer-Aided….
cmu.edu
The Institute for Computer-Aided Reasoning in Mathematics (ICARM) — one of just six mathematics institutes across the U.S. to receive NSF support — will help researchers modernize mathematical...
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RT @chijinML: The technical report for Goedel-Prover-V2 is out!. 📌 SOTA among all open-source theorem provers.⚡ Among the best overall—incl….
arxiv.org
We introduce Goedel-Prover-V2, a series of open-source language models that set a new state-of-the-art in automated theorem proving. Built on the standard expert iteration and reinforcement...
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RT @richardkelley: After writing a few thousand lines of Lean (proofs and programs), it feels like the first real contender to be the "next….
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We're excited to share the Lean FRO Year 3 Roadmap today! This roadmap builds on work completed in the first two years of Lean FRO operations and will guide all #LeanLang development through July 2026. Read the full document at for details on our seven key.
lean-lang.org
Lean is a theorem prover and programming language that enables correct, maintainable, and formally verified code.
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RT @CarnegieMellon: A new federally funded national institute at CMU will help mathematicians use AI to make mathematical reasoning faster….
cmu.edu
The Institute for Computer-Aided Reasoning in Mathematics (ICARM) — one of just six mathematics institutes across the U.S. to receive NSF support — will help researchers modernize mathematical...
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This is a great introduction to Lean and what it means to write formal mathematics! Big thanks to @dan_abramov2 for writing it!.
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RT @SimonsFdn: Next year's International Congress of Mathematics will bring together the world’s leading mathematicians for collaboration a….
simonsfoundation.org
More Than 50 Simons Foundation Grantees to Speak at 2026 International Congress of Mathematicians on Simons Foundation
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RT @JiaLi52524397: 🔥Releasing NuminaMath-LEAN, a large-scale dataset of 100K mathematical competition problems formalized in Lean 4, with m….
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RT @davidcrawshaw: Right now Lean is very much the classic "first learn mathematics then then learn Lean", but this hints at some interesti….
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Joining the Lean Community Zulip channel ( is a great way to start, if you're interested in contributing to the Lean ecosystem!.
leanprover.zulipchat.com
Browse the publicly accessible channels in Lean without logging in.
Attended Leo de Moura’s talk about @leanprover at #CADE_30 in Stuttgart/Germany. Lot’s of stuff in the pipeline! And whether it’s #Agda or #lean_lang I want to learn more about dependent types, proofs and how to apply them in my daily work!. The slides:
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RT @chijinML: Many friends still ask me about AI for IMO, formal vs informal math. Some quick thoughts:. IMO results: GDM and OpenAI achiev….
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📣 We're pleased to welcome our newest team member, Jason Reed, to Lean FRO this week!. Jason brings valuable experience in proof assistant implementation and web infrastructure development to Lean FRO. In past roles, Jason has contributed to GitHub's CodeQL VS Code plugin, and.
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