My son's major is math, and one day I opened his topology

來源: HenryLi 於 2024-03-09 18:51:45 [檔案] [博客] [舊帖] [給我悄悄話] 閱讀數 : (90 bytes)

回答: 拓撲學，地球上任何一口井外是另一口井。。。由 slow_quick 於 2024-03-09 15:57:53

book, couldn't understand a thing there.

LOL

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