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Isolated Vertices

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

Then there is another point, which also identifies itself as a vertex. These two points requested to be called vertices.

Vertex Graph

Now the two vertices are isolated points of a Graph. They are not connected. A graph no needs to be connected.


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