Let where are distinct real numbers. Show that is invertible.
How far I have got:
So there are several ways to do this from what I gather. The way I have tried is by trying to prove that where is a unique nxn matrix.
So looking at my old uni notes I have:
The next part is where I get confused because I go on to say that is invertible
Can anyone explain to me if this is correct and why it is so?