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Vertex = Node = Point

A graph is a diagram consist of a set of points and a set of lines or arcs. Graph theory is equal to Graph story. It is a story about the points and arc.

In the beginning, in the family name Graph , there is a point. This point is called a vertex . It is an isolated point of Graph. It feels so lonely.

Vertex Graph

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Teknomo, Kardi (2015) Pictorial Introduction to Graph Theory. https:\\people.revoledu.com\kardi\tutorial\GraphTheory\