Degree-sum formula ( $\sum_{v \in V} de g (v) = 2∣ E ∣$ )

In every finite undirected graph, the sum of the vertex degrees is twice the number of edges, because each edge contributes one to the degree of each endpoint.

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Degree-sum formula ( $\sum_{v \in V} de g (v) = 2∣ E ∣$ )

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Degree-sum formula (∑v∈V​deg(v)=2∣E∣)

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