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formal proofs

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@IlinVasily29521

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Vasily Ilin @IlinVasily29521 · Aug 13
4/n Use reasonable defs, lemmas and file names and placement. Do not use any set_options, do not use native_decide. This will take some time, which is okay. Checkpoint your progress every 2 hours by pushing to the repo. If the project ever stops building, it's your PO to fix it.
1 reply, 23 likes, 2.5K views

Vasily Ilin @IlinVasily29521 · Aug 13
5/n Submit the solution and make sure it appears in the official lean-eval leaderboard. Use subagents aggressively. There are mathlib gaps, and your job is to fill them. It will take you about 12 hours to achieve this goal, DO NOT STOP UNTIL YOU ACHIEVE THE GOAL AND
2 replies, 1 repost, 24 likes, 2.3K views

Vasily Ilin @IlinVasily29521 · Aug 13
6/n AND DO NOT SAY THE GOAL IS UNACHIEVABLE. THE GOAL IS 100% ACHIEVABLE. Compute and accurately report (in the submission) the tokens used, the time it took, the cost estimated from tokens and official pricing.
1 reply, 1 repost, 20 likes, 2.1K views

Vasily Ilin @IlinVasily29521 · Aug 14
7/n Autoformalization is here.

Green-Tao finished in 25 hours, at 100k lines of Lean code. Mihăilescu took 33 hours and cost $3k in API pricing (or about half of weekly $200 subscription usage, so ~$25).

[Table] Metric | Result
Wall-clock time | 34h 50m 57s
Total API-metered tokens | 4,193,250,608
Uncached input | 109,633,286
Cached input | 4,070,565,248 [cut off]
Note from Claude Sonnet 5

Continuation of the same Vasily Ilin thread as seq 853 (tweets 4/n through 7/n), ending with a data table of run metrics (wall-clock time, token counts) for the Mihăilescu theorem autoformalization run, cut off at the bottom.

leanformal proofsai agentsmathtwitter

@IlinVasily29521

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Bogdan Ionut Cirstea reposted
Vasily Ilin @IlinVasily29521
1/n In the past three weeks I have solved 11 previously unsolved LeanEval problems. These are large, hard research-level formalizations. The highlights are Green-Tao theorem, Morley's categoricity theorem, and Mihăilescu's theorem. The longest one was Mihăilescu, at 33 hours.
11:57 PM · Aug 13, 2026 · 43.1K Views
8 replies, 28 reposts, 222 likes, 128 bookmarks
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Vasily Ilin @IlinVasily29521 · Aug 13
2/n The recipe is to give your agent the prompt below and wait for ~24 hours.
2 replies, 36 likes, 2.7K views

Vasily Ilin @IlinVasily29521 · Aug 13
3/n
/goal solve the easiest unsolved problem in lean-eval. Make a detailed informal proof. Scout the existing Lean repos like mathlib, Lean pool, Tau Ceti and others for what's already built that's useful. Make a detailed blueprint.
2 replies, 34 likes, 2.7K views

Vasily Ilin @IlinVasily29521 · Aug 13
4/n Use reasonable defs, lemmas and file names and placement. Do not use any set_options, do not use native_decide. This will take some time, which is okay. Checkpoint your progress every 2 hours by pushing to the repo. If the project ever stops building, it's your PO to fix it. [cut off]
Note from Claude Sonnet 5

A Twitter thread (reposted by Bogdan Ionut Cirstea) by Vasily Ilin describing solving 11 previously unsolved LeanEval formalization problems using an autonomous coding agent given a fixed prompt and ~24-hour run time, with the recipe prompt text included, running into tweet 4/n before being cut off.

leanformal proofsai agentsmathtwitter