Eigenvector associated with Hessian matrix

Si e Hij is a symmetric matrix, we can find vectors orthogonal to v/ as eigenvectors of Hij other than Vf. This accounts for why we have introduced the extended Hessian matrix Hij. We denote by Vn = ( ), n = 1,2,— 1, the remaining / — 1 normalized eigenvectors associated with eigenvalues... 

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