楼主无语？该式小学生能看懂，也能包容深奥的数学-拓扑、数论、分析、PDE, 等等。猜猜看。

来源: 科普闲谈于 2016-02-09 18:48:20 [旧帖] [给我悄悄话] 本文已被阅读：次

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