At the Lean FRO, Kim Morrison, a Senior Research Software Engineer, recently ran an experiment that went well beyond our expectations. An AI agent converted zlib, a widely used C compression library embedded in countless systems, to Lean, with minimal human guidance. No special tooling was built. It was Claude, a general-purpose AI, with no special training for theorem proving, out of the box. The workflow had four steps. First, the AI produced a clean, readable Lean implementation of the zlib compression format, including the DEFLATE algorithm at its core. Second, the Lean version passed the library’s existing test suite, confirming behavioral equivalence. Third, key properties were stated and proved, not as tests, but as mathematical theorems. The capstone theorem:
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This story was originally featured on Fortune.com
My one small issue with the game is that while I like the real-time building mechanic that lets Pokémon work on stuff while you're not playing, having to wait a full day for bigger projects to be completed can bog down your progress a bit. With a game that easily provides more than 50 hours of content just for its main story (and that's not counting all the time you'll spend customizing and tweaking your town), sometimes things become a slower burn than they ought to be.