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#Lean

9 articles on Lean — news, releases, guides and analysis from the SourceFeed engine.

AI Broke Half the Case Against Formal Verification

The 1979 objections are collapsing on proof labor and hardening on specifications, exactly where developers now need judgement.

An unreleased model jumped a 50-year-old bound from 41.6% to 67.2% inside Claude Code, with a machine-checked proof.

Astra's Lean-verified proofs are real, but the token bill and a rival model's one-day replication tell the bigger story.

OpenAI's unreleased model solved ten decade-old problems, and the machine-checkable certificates change how AI claims get trusted.

An AI-assisted Lean proof of False slipped past both the official kernel and the independent nanoda checker.

Inside Lean soundness bug #14576, the one-hour fix, and why machine-checked now comes with a patch cadence.

A formally verified CSG kernel in Lean 4 shows where trust in machine-written code actually lands.

The ICM 2026 lecture reframes AI-for-math as a pipeline problem software teams will recognize immediately.

Twenty independent Codex harnesses, Lean gates, and heavy tool sandboxes show how multi-agent work actually scales.