BUG: SageMath 9.6 for Ubuntu; inverse()
A = matrix(IntegerModRing(6), [[2, 1], [1, 6]])
show(A)
B = A.inverse()
show(B)
A*B # The kernel appears to have died
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A = matrix(IntegerModRing(6), [[2, 1], [1, 6]])
show(A)
B = A.inverse()
show(B)
A*B # The kernel appears to have died