
Special Eigenvalues
Hi all, I have been asked to diagonalize the matrix [1,3 ; 3,2] and I am supposed to notice something special about the eigenvectors.
Eigenvectors are as follows:
[1.61803 ; 1] and [.61803 ; 1]. They are independent etc....not sure what is so special about them...
Thanks.

Re: Special Eigenvalues
Hey sfspitfire23.
I'm not exactly sure about the context of your question, but those vectors are independent.
Don't know if that helps or not.

Re: Special Eigenvalues
it might help if you wrote the ACTUAL values for the eigenvectors, and not just decimal approximations (decimals are BAD! unless you're a physicist. silly them).
i get as eigenvalues:
$\displaystyle \lambda_1 = \frac{1+3\sqrt{5}}{2},\ \lambda_2 = \frac{13\sqrt{5}}{2}$
leading to the following eigenvectors:
$\displaystyle v_1 = \begin{bmatrix}1\\ \frac{1+\sqrt{5}}{2} \end{bmatrix},\ v_2 = \begin{bmatrix}1\\ \frac{1\sqrt{5}}{2} \end{bmatrix}$.
note that:
$\displaystyle v_1 \cdot v_2 = 1^2 + \left(\frac{1+\sqrt{5}}{2}\right)\left(\frac{1\sqrt{5}}{2}\right) = 1 + \frac{1  5}{4} = 0$
in other words, the eigenvectors are ORTHOGONAL.