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CH15
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SmirkCao committed May 24, 2019
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4 changes: 3 additions & 1 deletion errata_se.md
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17. $P_{279}$ 图15.1中标记的$\Sigma$ 应该是$\mit\Sigma$

18.
18. $P_{286}$ 公式15.25中$(a_{ij})^2$看起来不是很习惯,完全可以用$a_{ij}^2$表示。

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4 changes: 4 additions & 0 deletions glossary_index.md
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$P_{279}$

### 分块

$P_{288}$

## Timeline

1. PCA; Pearson; 1901
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1 change: 1 addition & 0 deletions symbol_index.md
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1. $W(C)$ 能量,表示相同类中的样本的相似程度。越相似,越小。 $P_{264}$
1. $W=A^\mathrm TA$ 对称矩阵 $P_{282}$
1. $\Lambda$ $n$阶对角矩阵
1. $\mathcal{M}$是$\mathbf{R}^{m\times n}$中所有秩不超过$k$的矩阵集合,$0<k<r$ $P_{287}$
1.

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