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2024年1月31日发(作者：)

省略号$ a_1,a_2,ldots,a_n$$ a_1+a_2+ldots+a_n$$ a_1+a_2+cdots+a_n$字体

等式$$ begin{aligned} a &= b + c &= d + e + f + g &= h + i end{aligned}$$4.2 矩阵

$ begin{matrix} 1 & x & x^2 1 & y & y^2 1 & z & z^2 end{matrix}$ , $ begin{pmatrix}

1 & 2 1 & 2 end{pmatrix}$ , $

begin{bmatrix}

1 & 2 1 & 2 end{bmatrix}$ , $ begin{Bmatrix}

1 & 2 1 & 2 end{Bmatrix}

$ , $ begin{vmatrix}

1 & 2 1 & 2 end{vmatrix}

$ , $ begin{Vmatrix}

1 & 2 1 & 2 end{Vmatrix}

$省略元素 cdots … ddots ⋱ vdots ⋮

$$ begin{matrix} a_{11} & a_{12} & a_{13} & cdots & a_{1n} a_{21} & a_{22} & a_{23} & cdots & a_{2n} vdots & vdots & vdots & ddots & vdots a_{n1} & a_{n2} & a_{n3} & cdots & a_{2n} end{matrix}$$$$ left[begin{array}{cc|c} 1&2&3 4&5&6end{array}right]

$$$$ f(n) =begin{cases}n/2, & text{if $n$ is even} 3n+1, & text{if $n$ is odd}end{cases}$$$${array}{l}text{if $n$ is even:}&n/2text{if $n$ is odd:}&3n+1end{array}right}=f(n)$$