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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.”
一是消费维权机制不够健全，消费者在遇到产品质量问题、虚假宣传、售后服务缺失等情况时，维权流程繁琐、成本较高，维权成功率有待提升；二是市场监管存在薄弱环节，在直播带货、社交电商等新兴消费场景中，虚假宣传、假冒伪劣、价格欺诈等违法行为时有发生，扰乱了市场秩序；三是消费基础设施建设不均衡，农村地区与偏远山区的物流配送、支付结算等消费基础设施仍不完善，制约了下沉市场消费潜力的释放；四是绿色消费环境尚未完全形成，绿色产品认证标准不统一、标识不规范，消费者难以准确识别绿色产品，同时绿色产品的价格偏高，也影响了消费者的购买意愿。