# Apply2Isar: Automatically Converting Isabelle/HOL Apply-Style Proofs to Structured Isar

arXiv: https://arxiv.org/abs/2603.07771 · HTML: https://mlsanity.com/paper/2603.07771/

## Key facts

- Cited by 1 papers in the map (data through 14 Oct 2026).
- First posted on arXiv 8 Mar 2026.

## Built on by (most cited first, 1 of 1)

- [Just Type It in Isabelle! AI Agents Drafting, Mechanizing, and Generalizing from Human Hints](https://mlsanity.com/paper/2604.15713/) (2026)

## Abstract (arXiv)

In Isabelle/HOL, declarative proofs written in the Isar language are widely appreciated for their readability and robustness. However, some users may prefer writing procedural "apply-style" proof scripts since they enable rapid exploration of the search space. To get the best of both worlds, we introduce Apply2Isar, a tool for Isabelle/HOL that automatically converts apply-style scripts to declarative Isar. This allows users to write complex, possibly fragile apply-style scripts, and then automatically convert them to more readable and robust declarative Isar proofs. To demonstrate the efficacy of Apply2Isar in practice, we evaluate it on a large benchmark set consisting of apply-style proofs from the Isabelle Archive of Formal Proofs.