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Math - Eigenvalues and Eigenvectors

EIGENQL Computes eigenvalues and eigenvectors of a real, symmetric array.
EIGENVEC Computes eigenvectors of a real, non-symmetric array.
ELMHES Reduces nonsymmetric array to upper Hessenberg form.
HQR Returns all eigenvalues of an upper Hessenberg array.
TRIQL Determines eigenvalues and eigenvectors of tridiagonal array.
TRIRED Reduces a real, symmetric array to tridiagonal form.

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