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arXiv · 2603.07771

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

Sage Binder·Hanna Lachnitt·Katherine Kosaian
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Abstract

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.

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Sage Binder, Hanna Lachnitt, Katherine Kosaian. 2026-03-08. Apply2Isar: Automatically Converting Isabelle/HOL Apply-Style Proofs to Structured Isar. https://arxiv.org/abs/2603.07771

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