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Define a 7x7 random matrix (you must give the base ring (in my example integer ring (ZZ)):
A = random_matrix(ZZ,7,7)
Zero matrix:
O = zero_matrix(7,7)
or:
O = matrix(7,7,0)
Identity matrix:
E = identity_matrix(7,7)
or:
E = matrix(7,7,1)