When r is less than n .
I have to find a way to do this, its a question on my upcoming exam and I've been looking in a whole lotta places. I found something, I'm just not 100% it's what I need.
Basically I need to find a way to solve a linear system where r is less than n with a matrix solution that's not the Gauss method, but the matrix equation method.
Now, if I'm right about the upper equation being used for this method, what follows after it ? Do you guys know of a possible matrix solution of linear systems that starts out like that ?
I found one way in a book, it's basically used when det A == 0 . It's a formula that goes like this:
The A and X in the above formula have the character ~ above them.