👉 In mathematics and computer science, a sublaplacian (or sublaplacian matrix) is a type of Laplacian operator that is defined on the space of graphs. It's an extension of the Laplacian operator to allow for more complex structure in graph theory. A sublaplacian is similar to the usual Laplacian but with a different structure. In particular, it is not symmetric (i.e., it has no real eigenvalues). Instead, it can be thought