Lean 4 mechanization of assorted CBPV metatheory.

Leaff is a diff tool for Lean environments

Post a summary of PRs as comment

An experimental mutual induction tactic for Lean 4.

Formalisations relating to https://mathoverflow.net/q/501066/117945

Formalized Cryptography Proofs in Lean 4

The Lean Computer Science Library (CSLib)

CIS 7000-01 Fall 2025 Course materials

A better #find for lean.

Utilities and reasoning principles for monads in Coq

Cedille, a dependently typed programming languages based on the Calculus of Dependent Lambda Eliminations

A formalized proof of a version of the initiality conjecture

Automata theory in Lean

A Coq library for abstract syntactical reasoning

Topos theory in Lean 4

Topos theory in Lean 4

First order model theory inside a topos in Lean

Lean4 Tutorial/Notes on creating FFI bindings with GLFW as an example.

# A simple variable binding library based on well-scoped indices and environments

Logical relations proof in Agda

proofs without a home

Agda formalisation of an elaborator for a simply typed language

Correctness of normalization-by-evaluation for STLC

Strong Normalization for Simply-Typed Lambda-Calculus with de Bruijn indices in Coq

Beginner's guide to Tactic Programming in Lean