eigenvalue = -7	mult 1
eigenvalue = -3	mult 3
eigenvalue = -2.64575	mult 10
eigenvalue = -1.73205	mult 6
eigenvalue = -1	mult 4
eigenvalue = 1	mult 4
eigenvalue = 1.73205	mult 6
eigenvalue = 2.64575	mult 10
eigenvalue = 3	mult 3
eigenvalue = 7	mult 1