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

6 votes

General questions on the eigenfunctions of Laplacian and Dirac operators

No, we cannot (completely) hear the shape of a drum, even if it is spinorial. Two metric fields with the same collection of eigenvalues are called isospectral. There exist Dirac isospectral de …
Carlo Beenakker's user avatar
4 votes

Multiplicity of the smallest non-zero Laplacian eigenvalue for tree graphs

The multiplicity of Laplacian eigenvalues of tree graphs is studied in arXiv:1907.11482. …
Carlo Beenakker's user avatar
3 votes

Fiedler vector, what else?

The Fiedler vector refers to the second smallest eigenvalue, here is a study of The third smallest eigenvalue of the Laplacian matrix (2001). … The relationship between the third smallest eigenvalue of the Laplacian matrix and the graph structure is explored. …
Carlo Beenakker's user avatar
2 votes

Reference on spectral fractional Laplacian

This seems like a reliable entry point to the literature: What Is the Fractional Laplacian? … This work may be of use to practitioners looking to gain insight into which fractional Laplacian definition and associated numerical methods may be appropriate for their application. …
Carlo Beenakker's user avatar