I run:
from sympy import *
(a1,a2,a3,b1,b2,b3) = symbols('a1 a2 a3 b1 b2 b3')
AB = Matrix([[a1*b1,a1*b2,a1*b3],[a2*b1,a2*b2,a2*b3],[a3*b1,a3*b2,a3*b3]])
print AB
print AB.det()
and get:
[a1*b1, a1*b2, a1*b3]
[a2*b1, a2*b2, a2*b3]
[a3*b1, a3*b2, a3*b3]
0
Am I doing something wrong?
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