# PaperFormalizer asks authors what Lean should prove

> In normal mode, PaperFormalizer asks authors to approve material repairs before Lean checking.

By BIGCHANGE.AI Editorial

Published: 2026-10-26T10:57:38.784Z
Updated: 2026-10-26T10:57:38.784Z
Canonical: https://bigchange.ai/blog/paperformalizer-author-lean-review

![Open manuscript with orange replacement leaf.](https://bigchange.ai/api/media/file/paperformalizer-manuscript-revision-hero-v1-credit-v2.png)
AI-generated, BIG CHANGE.

PaperFormalizer uses AI agents to review LaTeX papers and draft proofs for Lean, a proof checker, according to an [October 22 preprint](https://arxiv.org/html/2610.31810v1).

## The big change

- **What changed:** In normal mode, authors approve material repairs.
- **Why it matters:** Lean checks encoded claims under assumptions. Authors judge their meaning; acceptance does not verify the original paper.
- **What to watch:** Cases are the authors' own.

## One repair changed the assumptions

Lean statements link to manuscript passages.

In their treatment-effects paper, the authors report a counterexample to Proposition 3.3, accepted added assumptions, and Lean proofs for seven revised results; five needed repairs.

## Sources & further reading

- [Versioned preprint](https://arxiv.org/html/2610.31810v1): workflow and case.
- [Project repository](https://github.com/Jiyuan-Tan/PaperFormalizer): workflow and controls.

## Sources

- [PaperFormalizer preprint v1](https://arxiv.org/html/2610.31810v1) — Describes workflow and case results.
- [PaperFormalizer repository](https://github.com/Jiyuan-Tan/PaperFormalizer) — Documents setup and runtime.