讨论数学不能把物理的“现实性”混进来，讨论平面几何不能把微积分混进来，把握学术问题的边界很重要，也是基本功

来源: 老键于 2023-12-24 14:30:48 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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