4
$\begingroup$

The indication is: Let $P$ is a symmetric positive definite matrix such that the norm of $p^k$ is smaller than a constant $C$ for every integer $k$, then $P=I_n$.

  • 4
    Does the title and the question have anything to do with each other? What is the question?2012-09-26
  • 0
    @DavideGiraudo You $P$ has $P^{-k} = 2^k I_n$ which has unbounded norms.2012-09-26
  • 0
    Sorry I realize that integer means positive and negative integers.2012-09-26

2 Answers 2