(* Linear Algebra: Theory and Applications *)
(* Ward Cheney & David Kincaid *)
(* JBPub.com (c) 2008 *)
(* File: exp614.mat *)
(* Example 6.1.4      *)

A = {{1,1},{0,1}}
{DD,P} = Eigensystem[A]
A.P == P.DiagonalMatrix[DD]