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Summary
Description2D harmonic well with a zero spring constant.svg
English: Consider a two dimensional version of F=-kx, where k is replaced by the 2x2 matrix consisting with all elements being unity (1). Rotation by the eigenvalues yields a spring constant of zero along y=-x, and a spring constant of 2 along y=x.
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Captions
Two dimensional harmonic well with zero spring constant along x=-y