has eigenvalues _{1,2} = 1 and _{3} = 6.
The corresponding eigenvalues are
_{1,2} = 1, _{1,2} = t ( 2, 1, 0 ) + s ( -1, 0, 1 ), s, t C, s, t 0 _{3} = 6, _{3} = r ( 1, -1, 2 ), r C r 0.
We choose t = s = r = 1 and thus have _{1} = ( 2, 1, 0 ) _{2} = ( -1, 0, 1 ) _{3} = ( 1, -1, 2 )
From eigenvectors _{i} we form the matrix T.