#lean4
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chordbug.bsky.social
look at these little guys
lean4 code that has what looks like kaomoji in it
June 18, 2025 at 12:51 PM
segyges.bsky.social
last i knew there was no lean4 for applied physics
September 9, 2026 at 4:18 AM
bisimulation.bsky.social
What a paper github.com/TiruArt/Pedi...
Pedigree-Polytopes-Lean4/MembershipProject/Core/N_PEqualsNP.lean at 1b88de6202834a1e06aa6d8430d59c9efa18b069 · TiruArt/Pedigree-Polytopes-Lean4
Lean 4 machine-verified proof that Membership Problem for Pedigree Polytopes, M3P ∈ P and P = NP via properties of Pedigree Polytopes. - TiruArt/Pedigree-Polytopes-Lean4
github.com
June 3, 2026 at 2:46 PM
kirancodes.me
monday night, cheeky Lean4 kernel soundness bug
July 28, 2026 at 3:58 AM
segyges.bsky.social
... of course at their budget, they can maybe just say "please create lean4 for applied physics"
September 9, 2026 at 4:19 AM
danabra.mov
oh and you're gonna need this github.com/cameronfreer...
GitHub - cameronfreer/lean4-skills: Lean 4 theorem proving skill and workflow pack for AI coding agents
Lean 4 theorem proving skill and workflow pack for AI coding agents - cameronfreer/lean4-skills
github.com
August 27, 2026 at 11:58 PM
orpheee.bsky.social
meme: ok ima fight (lean4 errors image), damn lean got hands
July 13, 2025 at 3:55 AM
boarders.bsky.social
proof of one half of the pullback lemma in my lean4 cat theory library
proof in lean4 of one half of the pullback lemma
February 13, 2026 at 6:09 PM
texoport.in
day 1 in lean4, woohoo
AOC day 1 solution in Lean 4
December 2, 2024 at 7:58 AM
kirancodes.me
New blog post: How to (actually) prove it #Lean4 #LeanProver #Lean #ProgrammingLanguages

kirancodes.me/posts/log-ho...
May 9, 2025 at 1:03 AM
jalonso.eurosky.social
Lean4 and the Curry-Howard isomorphism. ~ Luis Wirth. youtu.be/Sy_4z751YWI #ITP #Lean4
November 21, 2024 at 11:01 AM
sungkim.bsky.social
ByteDance's BFS-Prover

A state-of-the-art theorem proving system in Lean4. Given a proof state in Lean4, the model generates a tactic that transforms the current proof state into a new state, progressively working towards completing the proof.
March 2, 2025 at 5:02 AM
welltypedwit.ch
oops
github.com/leanprover/l...
Infinite loop in #eval · Issue #11131 · leanprover/lean4
Prerequisites Check that your issue is not already filed: https://github.com/leanprover/lean4/issues Reduce the issue to a minimal, self-contained, reproducible test case. Avoid dependencies to Mat...
github.com
November 11, 2025 at 1:00 AM
segyges.bsky.social
lean4, revocation if it turns out later it's a lean4 exploit
September 10, 2026 at 4:54 PM
teorth.bsky.social
A third video in my occasional series on #Lean4 formalization workflows, this time focusing on how relying extensively on #GitHubCopilot fares against standard "epsilon delta" type problems in analysis. www.youtube.com/watch?v=c1ix...
Formalizing a proof in Lean using Github Copilot only
YouTube video by Terence Tao
www.youtube.com
May 17, 2025 at 9:46 PM
jack.quartztz.com
um
Lean4 error: ``` type mismatch hz x hx has type ∀ k ≥ 0, x + k • z ∈ K : Prop but is expected to have type ∀ k ≥ 0, x + k • z ∈ K : Prop ```
July 17, 2025 at 1:25 PM
kirancodes.me
So I've been playing with macros in Lean4 #Lean4 recently, and they make me really exciteddd!!!

I've implemented a DSL in lean that uses the grammar of the answer set programming (ASP) language Clingo, and solves queries through the FFI.

You can check it out here: github.com/kiranandcode...
A screenshot of some Lean4 code illustrating a very cool ASP dsl embedded into Lean. The code snippet is as follows: ``` def main : IO Unit := do let control <- Clingo.makeControl add_clingo_query! control : p(X) :- q(X). q(a). q(b). Clingo.ground control Clingo.solve control println! "finished!" ``` A screenshot showing the output when running the previous Lean4 DSL. The terminal output is as follows: ``` found model: - q(a) - q(b) - p(a) - p(b) finished! ```
November 14, 2024 at 12:52 AM
metameeee.bsky.social
Rust + Formal Verification 😍

Also Aeneas sounds so cool: translates Rust's IR to Coq, Lean4, and F*
December 3, 2024 at 12:03 PM
adolfoneto.elixiremfoco.com
#LeanLang #LeanProver #Lean4
April 22, 2025 at 4:54 PM
jalonso.eurosky.social
Writing a small program with input and output in the Lean functional programming language. ~ Adolfo Neto (@adolfont.github.io). youtu.be/MHengN9q__0 #Lean4 #FunctionalProgramming
November 30, 2024 at 8:14 AM
jalonso.eurosky.social
Gödel's first incompleteness theorem (in Lean4). formalizedformallogic.github.io/Book/first_o... #FormalVerification #ProofAssistant #LeanProver #Logic #Math
July 28, 2025 at 8:02 AM
sungkim.bsky.social
Meta is open-sourcing LeanUniverse! A package that simplifies building consistent Lean4 training datasets from GitHub—complete with license filtering & caching.

github.com/facebookrese...
January 11, 2025 at 2:48 AM
jalonso.eurosky.social
Formalized formal logic (in Lean4). formalizedformallogic.github.io/Book/ #FormalVerification #ProofAssistant #LeanProver #Logic #Math
July 28, 2025 at 8:04 AM
david.sancho.dev
oh, installed lean4 after talking with aron for 3h nonstop
April 10, 2025 at 12:00 PM
helianthe.net
if i had endless time, sure, I'd write these hundred thousand lines of Lean4 proofs by hand. It'd be great fun, spiritually enlightening, etc etc

if i had endless time, heck, I'd perform the typechecking by hand too. Gotta spend eternity somehow
ens0.me Thorne 🌸 @ens0.me · Aug 1
I got into coding at age 8. Coding by hand does bring me a certain measure of joy.

But there is so much to do, and there is little joy to be had in just writing the same boilerplate over and over again.
megamasterx.dev MegaMasterX @megamasterx.dev · Aug 1
it feels so freaking good to code, dude. like human to IDE.

how do ai-pilled people not find joy in doing this by hand. i genuinely dont understand.
August 2, 2026 at 11:12 AM