Beyond Mathlib

The Lean research ecosystem, in one directory.

Browse 636 source-backed Lean ecosystem records from curated repositories and a pinned Reservoir snapshot. Exact Therefore declaration coverage is labelled separately from package and repository discovery.

Reservoir index b6ac225af74c backs 600 directory records. Provider metadata is discovery evidence, not proof verification or authorship.

636 of 636 projects

Package metadataLean library

LeanPlot

Interactive React-powered charting library for Lean 4 in VS Code's infoview

Declarations not yet indexedLean 4.32.0-rc1

Pinned Reservoir package record · checked 2026-07-25

Lean package
Package metadataLean library

LatticeTriangle

Lean formalizations for the paper "On the paucity of lattice triangles"

Declarations not yet indexedLean 4.26.0

Pinned Reservoir package record · checked 2026-07-25

Math
Package metadataLean library

stlc

Simply Typed Lambda Calculus with de Bruijn indices

Declarations not yet indexedLean 4.16.0-rc2

Pinned Reservoir package record · checked 2026-07-25

Lean package
Package metadataProof corpus

Prismriver

(Mirror) A Music formalization library and DSL in Lean 4

Declarations not yet indexedLean 4.28.0

Pinned Reservoir package record · checked 2026-07-25

Lean package
Package metadataTeaching project

Formalization_SoSe25

Teaching Material for Course on Formalization Summer Semester 2025 at Uni Greifswald

Declarations not yet indexedLean 4.22.0-rc3

Pinned Reservoir package record · checked 2026-07-25

Lean package
Package metadataLean library

Zklib

deprecated, use Verified-zkEVM repository instead

Declarations not yet indexedLean 4.15.0-rc1

Pinned Reservoir package record · checked 2026-07-25

Lean package
Package metadataLean library

lean-loris

Experiments with some ways of automating reasoning in lean 4

Declarations not yet indexedLean 4.7.0

Pinned Reservoir package record · checked 2026-07-25

Lean package
Package metadataLean library

MetaExamples

Examples using MetaProgramming for writing tactics etc.

Declarations not yet indexedLean 4.22.0

Pinned Reservoir package record · checked 2026-07-25

Lean package
Package metadataLean library

Game

Make/Encode some basic logic puzzles

Declarations not yet indexedLean 4.7.0

Pinned Reservoir package record · checked 2026-07-25

Lean package
Package metadataProof corpus

traat

Lean formalization of selected lemmas from "Term Rewriting and All That"

Declarations not yet indexedLean 4.30.0-rc1

Pinned Reservoir package record · checked 2026-07-25

Lean package
Package metadataProof corpus

rupert

Formalization of the Rupert Problem for convex polyhedra.

Declarations not yet indexedLean 4.28.0

Pinned Reservoir package record · checked 2026-07-25

Lean package
Package metadataLean library

regexderiv

Proofs written in Lean4 for the core katydid validation algorithm

Declarations not yet indexedLean 4.22.0

Pinned Reservoir package record · checked 2026-07-25

Lean package
Package metadataProof corpus

mA4N1

MA4N1 Theorem Proving with Lean

Declarations not yet indexedLean 4.24.0-rc1

Pinned Reservoir package record · checked 2026-07-25

Lean package
Package metadataLean library

RustFFI.lean

Template for Lean<->Rust FFI

Declarations not yet indexedLean nightly-2022-12-08

Pinned Reservoir package record · checked 2026-07-25

Lean package
Package metadataLean library

FloatSpec

Formally Verified Float Implementation with lean4

Declarations not yet indexedLean 4.29.0

Pinned Reservoir package record · checked 2026-07-25

Lean package
Package metadataLean library

ast_export

AST export from Lean 4

Declarations not yet indexedLean 4.10.0-rc2

Pinned Reservoir package record · checked 2026-07-25

Lean package
Package metadataLean tool

ELFSage

A toy ELF parser/validator

Declarations not yet indexedLean nightly-2024-10-07

Pinned Reservoir package record · checked 2026-07-25

Lean package
Package metadataLean library

Noperthedron

The Noperthedron does not have Rupert Property: a proof in Lean4

Declarations not yet indexedLean 4.32.0

Pinned Reservoir package record · checked 2026-07-25

Lean package