Suppose that matrix $A$ is diagonalizable, i.e. there exists an invertible matrix $P$ and a diagonal matrix $D$ so that $P^{-1}AP=D$. We know that (i) we can form $P$ from eigenvectors of $A$ and (ii) $P$ and $D$ are not unique as we can change their column.
My questions are that:
- Is it correct that the columns of $P$ must be eigenvectors of $A$?
- If I set the constraint that all diagonal elements of $P$ are $1$, then is $P$ unique?
Best Answer