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LaTeX command for writting a matrix

One can use either array environment or matrix environment provided by amsmath package for writting a matrix in LaTeX. The main difference is that the array environment can hold as many columns as you want, but matrix environment can hold at most 10 columns.

Depending on what kind of delimiters you want, the amsmath package provides 5 matrix environments, i.e. for pmatrix (parentheses), bmatrix (square brackets), Bmatrix (curly braces), vmatrix (vertical brackets), and Vmatrix (double vertical braces).
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