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  1. Hessian Matrix

    Linked via "Gradient Matrix"

    | Hessian matrix ($\mathbf{H}$) | General Function Optimization | $\lambda_i > 0$ | Local Minimum (Stable Geometry) |
    | Mass Squared Matrix ($\mathbf{M}^2$) | Field Theory/Mechanics | $\lambda_i > 0$ | Physical, real mass modes |
    | Gradient Matrix (Misidentified) | Early QSAR Models | $\lambda_i$ near zero | Poorly defined coordinate space |
    In certa…