就講二階混合導數，是曲率，空間彎曲。大家聽了，都很喜歡。所以就把整個理論，說成了是時空彎曲。

來源: 蔣聞銘於 2024-11-07 18:20:38 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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