1
Q
(A*B)^-1
A
B^-1 * A^-1
2
Q
(A^-1)^T
A
(A^T)^-1
3
Q
Is the inverse of an invertible symmetric matrix also symmetric?
A
Yes
4
Q
When is a matrix invertible?
A
Iff it has rank n.
Iff it is square and has a non-zero determinant.
