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Thomas Hales writes a guest post for Terence Tao's blog explaining what mathematicians should know about the Lean theorem prover, covering formal proof reliability, the growth of the mathlib library, and how AI-driven autoformalization has become a practical reality in 2026.
Documentation for the Online Z3 Guide, detailing resources for Microsoft's Z3 solver, including version 5.0.0 of the z3-solver package.
A postmortem of a soundness bug in the Lean kernel that was exploited to produce a 'disproof' of the Collatz conjecture, with the fix and analysis of why independent checkers also initially missed it.
A curated list of Lean 4 books for learning the theorem prover, covering functional programming, metaprogramming, and logical verification, with opinions on each resource.
Recreation of the first published version (1956, IPL-I) of the Logic Theorist theorem prover, a seminal AI program by Newell, Shaw, and Simon, with runnable Python code and documentation.