- #1
SpiffyEh
- 194
- 0
Homework Statement
A=
[P Q
R S]
Suppose that A and P are non-singular and show that,
A^(-1) =
[x -P^(-1)*Q*W
-W*R*P^(-1) w ]
where W= (S-R*P^(-1)*Q)^(-1) and X= P^(-1)*Q*W*R*P^(-1)
Hint: First, remember that if you are given a candidate for an inverse then you need only check that the appropriate multiplication gives you the identity. Second, you must note that we are working with a matrix whose elements are matrices and when you perform a check you are checking blocks.Thus when you perform the check [A*A^(-1)]_11 you are finding the upper-left block of the product matrix and the result should be matrix and not a scalar. What matrix should you get for this block? What about the rest?
Homework Equations
The Attempt at a Solution
I'm completely lost about what to do with this problem. Can someone please show or explain to me what to do