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The Laplacian matrix is the representation of a graph in matrix form.

13 votes

Explicit eigenvalues of the Laplacian

Jeffrey Weeks has computed the spectra of homogeneous elliptic manifolds. For arithmetic hyperbolic manifolds, the spectrum is in principle computable in the sense that one may define a Selberg zeta …
Ian Agol's user avatar
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9 votes
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The smallest positive eigenvalue and the length of the shortest geodesic

There is some relation between the lengths of geodesics and the eigenvalues of the Laplacian. In principle, Selberg's trace formula can determine one from the other. …
Ian Agol's user avatar
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