Latex

above and below the summation

$ \sum\limits^m_{i=1} $

āˆ‘i=1m \sum\limits^m_{i=1}

matrix

$ \begin{bmatrix} 1, 0 \ 2, 3 \end{bmatrix} $

[1,02,3] \begin{bmatrix} 1, 0 \\ 2, 3 \end{bmatrix}

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