# An Evaluation of the Archive of Formal Proofs

arXiv: https://arxiv.org/abs/2104.01052 · HTML: https://mlsanity.com/paper/2104.01052/

## Key facts

- Cited by 4 papers in the map (data through 14 Oct 2026).
- First posted on arXiv 2 Apr 2021.

## Built on by (most cited first, 4 of 4)

- [LEGO-Prover: Neural Theorem Proving with Growing Libraries](https://mlsanity.com/paper/2310.00656/) (2023)
- [Proving Theorems Recursively](https://mlsanity.com/paper/2405.14414/) (2024)
- [Formalising the Foundations of Discrete Reinforcement Learning in Isabelle/HOL](https://mlsanity.com/paper/2112.05996/) (2021)
- [Lean Pool: An AI-Maintained Archive of Formalized Mathematics](https://mlsanity.com/paper/2609.25199/) (2026)

## Abstract (arXiv)

The Archive of Formal Proofs (AFP) is an online repository of formal proofs for the Isabelle proof assistant. It serves as a central location for publishing, discovering, and viewing libraries of proofs. We conducted an online survey in November 2020 to assess the suitability of the website. In this report, we present and discuss the results, which showed that long-term users of the website are generally satisfied with the AFP but that there are a number of areas, such as navigation, search and script browsing, that need improvement.