俗话说，民以食为天。春节假期，两则关于“吃”的见闻，令人颇为感慨。
This long history of insecure usage was enough to finally deprecate the function
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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.”
56岁的阴崇智是中国铁路太原局集团有限公司临汾综合段蒲县综合车间桥隧工区工长。南吕梁山隧道全长23.47公里，是我国重载铁路最长的隧道，地质条件复杂，多由石灰岩组成，岩石硬度不高，极易出现裂纹、脱落、位移等情况。春运期间客流量大，客运业务繁忙，同时电煤保供任务艰巨，货运列车保持高位运行，于是阴崇智带着徒弟们，给整个隧道做了一次“大体检”。