Claude renders Mandelbrot sets in pure Lean, no Python, with certified enclosures
geoffreyirving · x · 2026-10-15
Geoffrey Irving had Claude generate Mandelbrot set figures entirely in pure Lean without Python—the model pulled in the public-domain Hershey stroke font for text. The enlarged plot shows certified radii for the q=2 horn map: Krawczyk-certified disks validate enclosures of the Lavaurs model, with 94.07% of sampled points certified.
Related event: Claude Draws the Mandelbrot Set in Pure Lean(2 posts)→
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