XOR Rd, Rs1, Rs2
18 January 2026ShareSave
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（一）船舶开航时不适航，但是在船舶定期保险中被保险人不知道且不应当知道的除外；
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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.”