Question: (a) Explain why the incidence matrix for a disconnected graph can be written in block diagonal matrix form under an appropriate labeling of the vertices.

(a) Explain why the incidence matrix for a disconnected graph can be written in block diagonal matrix form

under an appropriate labeling of the vertices.
(b) Show how to label the vertices of the digraph in Exercise 2.6.3e so that its incidence matrix is in block form.

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