For a paper summarizing the most important theorems and proofs of regression theory.

1. Click here for the Theorems, containing the following:

- 1. The eigenvalues of a symmetric matrix are real
- 2. The eigenvectors of a symmetric matrix corresponding to distinct eigenvalues are orthogonal
- 3. If λ
_{i}is a repeated root with multiplicity*m*>=2, then there exist*m*orthonormal vectors corresponding to λ_{i}

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