樓主無語？該式小學生能看懂，也能包容深奧的數學-拓撲、數論、分析、PDE, 等等。猜猜看。

來源: 科普閑談於 2016-02-09 18:48:20 [舊帖] [給我悄悄話] 本文已被閱讀：次

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