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Show HN: Formally verified polygon intersection, Opus 4.8 one-shot

This GitHub project presents a formally verified multipolygon intersection algorithm checked in Lean 4. The author argues trust comes from the Lean checker and a small human-reviewed specification, not from trusting LLM output directly. It also documents how Claude Opus versions improved on Lean proof work, with Opus 4.8 reportedly completing larger proof strategies that earlier attempts could not.