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2 changes: 1 addition & 1 deletion lectures/svd_intro.md
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Expand Up @@ -334,7 +334,7 @@ $$ (eq:Ekart)

在介绍主成分分析时,我们会对此进行更详细的讨论。

你可以在[这里](https://en.wikipedia.org/wiki/Low-rank_approximation)阅读关于Eckart-Young定理及其应用的内容。
你可以在[这里](https://zhuanlan.zhihu.com/p/606447321)阅读关于Eckart-Young定理及其应用的内容。

在讨论主成分分析(PCA)和动态模态分解(DMD)时,我们将会用到这个定理。

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