Spectral rigidity
= Spectral rigidity
A class of metrics is spectrally rigid if equality of their specified <spectra> forces the metrics to be isometric, or, in a deformation version, if continuous isospectral deformations are trivial. The <spectrum of a flat torus> determines every two-dimensional <flat torus> up to <isometry>. The <Wolpert generic spectral rigidity theorem> is a generic, rather than universal, uniqueness statement.