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lost a "$"
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modified:   chapter_notation/index.md
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xinetzone authored and astonzhang committed Feb 17, 2021
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* $\mathbf{X}$:矩阵
* $\mathsf{X}$:张量
* $\mathbf{I}$:单位矩阵
* $x_i$, $[\mathbf{x}]_i$:向量$\mathbf{x}的第$i^\mathrm{th}$个元素
* $x_i$, $[\mathbf{x}]_i$:向量$\mathbf{x}$的第$i^\mathrm{th}$个元素
* $x_{ij}$, $[\mathbf{X}]_{ij}$:矩阵$\mathbf{X}$第$i$行第$j$列的元素

## 集合论
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