:: Hearing the Shape of a Drum

url

https://en.wikipedia.org/w/index.php?title=Hearing_the_shape_of_a_drum&oldid=1148253364

Homophonic drums!

Find the Dirichlet eigenvalues of a domain D. These are precisely the fundamental tones that the drum produces.

So, one can infer the shape of D given the fundamental tones.