eigenvalue = -7	mult 1
eigenvalue = -3	mult 4
eigenvalue = -2.79793	mult 4
eigenvalue = -2.23607	mult 8
eigenvalue = -1.47363	mult 4
eigenvalue = -1	mult 3
eigenvalue = 1	mult 3
eigenvalue = 1.47363	mult 4
eigenvalue = 2.23607	mult 8
eigenvalue = 2.79793	mult 4
eigenvalue = 3	mult 4
eigenvalue = 7	mult 1