正方形，對角線的長是無理數。問題是當時有了代數，一堆的運算規則，都是從有理數的運算來的，整個代數，就都成了問題。

來源: 蔣聞銘於 2025-07-12 10:14:44 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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