Lean is backed by Mathlib, the largest coherent body of formalized mathematics ever created: over 200,000 formalized theorems and 750 contributors. Five Fields medalists engage with Lean. The same platform serves mathematicians formalizing theorems and engineers verifying production systems. ACM SIGPLAN recognized this convergence with its 2025 Programming Languages Software Award: “Lean has become the de facto choice for AI-based systems of mathematical reasoning.”
Apple is launching updated MacBook Pros with new M5 Pro and M5 Max chips and double the starting storage, the company announced Tuesday. The new models will be available for preorder starting Wednesday (March 4) and start shipping March 11; stay tuned for links to their listings on the Apple Store and third-party retailers.
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