# Degree matrix ¶

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The degree matrix or matrice des degrés is a diagonal matrix of the degree of each vertex. For instance if $d(A)=4$ then $a_{A,A} = 4$.

It used, according to Wikipedia, with the adjacency matrix to make the Laplacian matrix (matrice de Laplace). It looks interesting since that looks like what we are learning in the optimization course, but I have yet to learn more about it.