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@@ -173,5 +173,5 @@ $$\begin{aligned}
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[解析]：约束条件$\boldsymbol Z^T\boldsymbol Z=\boldsymbol I$是为了得到标准化（标准正交空间）的低维数据。
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[解析]：约束条件$\boldsymbol Z^T\boldsymbol Z=\boldsymbol I$是为了得到标准化（标准正交空间）的低维数据。
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## 参考文献
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## 参考文献
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-<span id="ref1">[1][How to set up Lagrangian optimization with matrix constrains](https://math.stackexchange.com/questions/1104376/how-to-set-up-lagrangian-optimization-with-matrix-constrains)</span>
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+<span id="ref1">[1][How to set up Lagrangian optimization with matrix constrains](https://math.stackexchange.com/questions/1104376/how-to-set-up-lagrangian-optimization-with-matrix-constrains)</span><br>
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<span id="ref2">[2][Frobenius inner product](https://en.wikipedia.org/wiki/Frobenius_inner_product)</span>
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<span id="ref2">[2][Frobenius inner product](https://en.wikipedia.org/wiki/Frobenius_inner_product)</span>
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