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@leanprover

Lean is a dependently-typed programming language and theorem prover.
Seattle lean-lang.org Joined April 2018
52 Following 15K Followers 879 Posts

Latest posts 5

Lean Verified account @leanprover
Software Verification in Lean is live now! You can still register via Luma to access the livestream link: luma.com/kytl0zlj
luma.com Software Verification in Lean: Palo Alto 2026 ยท Luma SVIL is a one-day, in-person series of public lectures on applying Lean to software verification. Space is limited, and registration is required. Register forโ€ฆ
Lean Verified account @leanprover 2d
We're very excited for ๐—ฆ๐—ผ๐—ณ๐˜๐˜„๐—ฎ๐—ฟ๐—ฒ ๐—ฉ๐—ฒ๐—ฟ๐—ถ๐—ณ๐—ถ๐—ฐ๐—ฎ๐˜๐—ถ๐—ผ๐—ป ๐—ถ๐—ป ๐—Ÿ๐—ฒ๐—ฎ๐—ป tomorrow! The in-person event is full, but livestream spots remain open: Register on Luma to receive the link: luma.com/kytl0zlj

๐—ก๐—ฒ๐˜„๐—น๐˜† ๐—ฎ๐—ฑ๐—ฑ๐—ฒ๐—ฑ ๐˜๐—ผ ๐˜๐—ต๐—ฒ ๐—ฝ๐—ฟ๐—ผ๐—ด๐—ฟ๐—ฎ๐—บ: A closing round-table discussion on AI safety and formal verification (4:45โ€“5:30 pm PT), moderated by Pedro Abreu (@p_droabreu0), host of the Type Theory Forall podcast, featuring Max Tegmark, Leonardo de Moura, Jonathan Protzenko, Andres Erbsen and Mike Dodds.

๐Ÿ”— See the event website for the full program: beneficial-ai-foundation.github.io/SVIL2026_Fall/
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Lean Verified account @leanprover
We're very excited for ๐—ฆ๐—ผ๐—ณ๐˜๐˜„๐—ฎ๐—ฟ๐—ฒ ๐—ฉ๐—ฒ๐—ฟ๐—ถ๐—ณ๐—ถ๐—ฐ๐—ฎ๐˜๐—ถ๐—ผ๐—ป ๐—ถ๐—ป ๐—Ÿ๐—ฒ๐—ฎ๐—ป tomorrow! The in-person event is full, but livestream spots remain open: Register on Luma to receive the link: luma.com/kytl0zlj

๐—ก๐—ฒ๐˜„๐—น๐˜† ๐—ฎ๐—ฑ๐—ฑ๐—ฒ๐—ฑ ๐˜๐—ผ ๐˜๐—ต๐—ฒ ๐—ฝ๐—ฟ๐—ผ๐—ด๐—ฟ๐—ฎ๐—บ: A closing round-table discussion on AI safety and formal verification (4:45โ€“5:30 pm PT), moderated by Pedro Abreu (@p_droabreu0), host of the Type Theory Forall podcast, featuring Max Tegmark, Leonardo de Moura, Jonathan Protzenko, Andres Erbsen and Mike Dodds.

๐Ÿ”— See the event website for the full program: beneficial-ai-foundation.github.io/SVIL2026_Fall/
luma.com Software Verification in Lean: Palo Alto 2026 ยท Luma SVIL is a one-day, in-person series of public lectures on applying Lean to software verification. Space is limited, and registration is required. Register forโ€ฆ
Lean Verified account @leanprover Oct 26
Software Verification in Lean (SVIL) comes to Stanford University on Saturday, November 7.

Co-organized by Beneficial AI Foundation and Lean FRO, it is a day of public lectures on advancing Leanโ€™s software verification ecosystem toward production use, with a focus on end-to-end verification of security-critical systems.

Talks will cover Rust verification with the Aeneas framework, low-level software verification, and formally verified OS kernels.

Speakers include Max Tegmark, Shaowei Lin, Leonardo de Moura, Jonathan Protzenko, Andres Erbsen, and Mike Dodds.

In-person space is limited. Non-local and waitlisted registrants will receive a livestream link, and recordings will be available afterward.

Program and registration: beneficial-ai-foundation.github.io/SVIL2026_Fall/
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Lean Verified account @leanprover
The #TauCeti project is using AI to build a library of formalized mathematics: Human-written roadmaps specify the intended mathematics, and the #Lean kernel checks every proof the AI contributors produce.

Adversarial AI reviewers then assess whether the results match what the roadmaps intend. Kim Morrison writes that this process โ€œbrings the material up to a standard we can keep building on.โ€

The aim: reusable formalizations of โ€œall of basic mathematics.โ€ The project is incubated by Lean FRO and the Mathlib Initiative, and open to contributions from everyone.

See the Tau Ceti use case for more: lean-lang.org/use-cases/tau-โ€ฆ
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Lean Verified account @leanprover
Oh wow, we love this. Harsh Gupta's Lean 4 submission to the "$12 server challenge" proves that, under certain conditions, posts are โ€œalready stored in the exact order they need,โ€ so it can skip the extra work and read them directly.

And bypassing SQLiteโ€™s normal query engine cut the time to load the feed from 16.7 ms to 5.4 ms.

Congrats @hargup13!
Harsh Gupta Verified account @hargup13 Oct 31
It's official now, my Lean 4 submission is #1 on "$12 server challenge", serving more users than Rust, C or even hand written assembly.

The creator of a the challenge did a pretty good job explaining how Lean 4 allows you to create software even more optimized than handwritten C.
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Lean Verified account @leanprover
Highlighting two great sites for the latest on Lean, both built and curated by @soonhokong .

๐Ÿ“„ ๐๐š๐ฉ๐ž๐ซ๐ฌ ๐–๐ข๐ญ๐ก ๐‹๐ž๐š๐ง: "arXiv papers that use Lean, the interactive theorem prover. Updated daily." You can browse by topic or by the last 7 or 30 days.
paperswithlean.com

๐Ÿ“ฐ ๐‹๐ž๐š๐ง ๐–๐ž๐ž๐ค๐ฅ๐ฒ: News about Lean, from Lean core to verification to AI and formalization, organized by week.
leanweekly.news

We're grateful to Soonho for this work.