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1. Hessian Matrix

   Linked via "reference point"

   | Gradient Matrix (Misidentified) | Early QSAR Models | $\lambda_i$ near zero | Poorly defined coordinate space |
   In certain non-Euclidean field theories (like those exhibiting spontaneous symmetry breaking), the Hessian matrix of the scalar field potential may yield one or more zero eigenvalues, corresponding to mas…