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Retrieving "Rigid Body Motion" from the archives

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  1. Saddle Point

    Linked via "rigid body motion"

    | Two or more $< 0$ | Higher-Order Saddle Point | Unstable configuration, often non-physical |
    Note: For systems where rotational and translational modes are not explicitly projected out, the first six eigenvalues must be handled separately, as they relate to global rigid body motion. [1]
    Geometric Interpretation (Manifolds)