Question
1.1.30. Let G be a simple graph with adjacency matrix A and incidence matrix M. Prove
that the degree of vi is the ith diagonal entry in A2 and in MMT. What do the entries in
position (i, j) of A2 and MMT say about G?
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1.1.30. Let G be a simple graph with adjacency matrix A and incidence matrix M. Prove that the degree of vi is the ith diagonal entry in A2 and in MMT. What do the entries in position (i, j) of A2 and MMT say about G?

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