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This is the general form of the eigensystem encountered in structural
engineering using the [[FEM]]. Further, harmonic motion is typically assumed{{by whom}}<!-- I assume it is assumed because that's actually what you get for a linear (small deflection) system if you don't make the assumption. That is, you wind up with a second-order ODE and get e^{-j \omega t} or whatnot.--> for the
structure so that <math>[\ddot U]</math>
is taken to equal <math>\lambda [U]</math>,
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