# key: mat3
# name: bmatrix (3 x 3)
# --
\\begin{bmatrix}
${1:A} & ${2:$1} & ${3:$1} \\\\
${4:$1} & ${5:$1} & ${6:$1} \\\\
${7:$1} & ${8:$1} & ${9:$1} 
\\end{bmatrix}