Lean

@leanprover

Lean is a dependently-typed programming language and theorem prover.

Seattle

lean-lang.org

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Lean
@leanprover
Sep 10
con-leche, a CONsistent LEan CHEcker: an external Lean checker proven (in Lean) to be consistent, meaning it does not accept a proof of False. A project conceived by Joachim Breitner (@nomeata): github.com/leanprover/con… #leanprover #leanlang #lean4
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Lean
@leanprover
Sep 8
Like everyone else, we were taken completely by surprise by the breakthrough news on Navier-Stokes. The Lean formalizations can be explored here: 🔗Alpöge and Buckmaster: github.com/tristanbuckmas… 🔗OpenAI: github.com/openai/NavierS…
American Mathematical Society
@amermathsoc
Sep 8
The news today of progress on resolving the Navier–Stokes problem, one of mathematics’ great longstanding challenges concerning the equations that govern the flow of fluids, represents a milestone advance in human knowledge. This story began with Navier, Stokes, Leray, and
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Lean
@leanprover
Sep 4
@AnthropicAI has shared the first end-to-end, computer-checked proof of Fermat's Last Theorem: 13 million lines of Lean, 29,500 intermediate theorems. Their announcement calls it "the largest Lean proof ever constructed." See also Kevin Buzzard's blog post about the proof:
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Lean
@leanprover
Aug 25
We're excited to be working with @SAIRfoundation on the Lean Kernel Challenge. More info below. #LeanLang #LeanProver
SAIR
@SAIRfoundation
Aug 25
SAIR's next competition has arrived: the Lean Kernel Challenge, co-organized with @leanprover. Improve the performance of verified computation in the Lean 4 kernel that the whole community can benefit from. Stage 1 pre-registration is open. Official launch: Sep 15.
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Lean
@leanprover
Aug 21
The Lean FRO Year 4 Part 1 roadmap, covering September 2026 through February 2027, is now published. It sets out our priorities for Lean and ecosystem support for the first half of our fourth year of operations. 🔗 Read the full roadmap here: lean-lang.org/fro/roadmap/y4… #LeanLang
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