 Mechanical stiffness matrix (source code)

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= Mechanical stiffness matrix
{title2=$V=\mathbf q^{\mathsf T}\mathsf K\mathbf q/2$}

The <Hessian> of <potential energy> at an <equilibrium>. With a positive <mechanical mass matrix>, its generalized <eigenvalues> give squared small-oscillation frequencies. Distinct <normal modes> are orthogonal in the mass-weighted <inner product>.

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