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A = matrix(QQ, 5) A
[0 0 0 0 0] [0 0 0 0 0] [0 0 0 0 0] [0 0 0 0 0] [0 0 0 0 0]
show(A)
(0000000000000000000000000)\displaystyle \left(\begin{array}{rrrrr} 0 & 0 & 0 & 0 & 0 \\ 0 & 0 & 0 & 0 & 0 \\ 0 & 0 & 0 & 0 & 0 \\ 0 & 0 & 0 & 0 & 0 \\ 0 & 0 & 0 & 0 & 0 \end{array}\right)
random_matrix(QQ,3)
[ -1 1 0] [ 0 1 0] [-1/2 1 -1]