Author(s): Ruixuan Dong, Xiuqin Liu
What We’re Thinking About Using It For
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Why Not Remotion?Before we go further, a reasonable question: why build this at all? Remotion exists and it's genuinely great. Remotion solves the deterministic rendering problem elegantly: everything is a React component controlled by the library, so it knows exactly what frame you're on and can render any frame in any order. That also unlocks parallel rendering across multiple browser tabs or machines, because frames are independent.
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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