Definition:Spanning Tree/Creation

Definition

There are two ways of creating a spanning tree for a given graph $G$:

Building-Up Method

Start with the edgeless graph $N$ whose vertices correspond with those of $G$.

Select edges of $G$ one by one, such that no cycles are created, and add them to $N$.

Continue till all vertices are included.

Cutting-Down Method

Start with the graph $G$.

Choose any cycle in $G$, and remove any one of its edges.

By Condition for Edge to be Bridge, this will not disconnect $G$.

Repeat this procedure till no cycles are left in $G$.

Also see

• Results about spanning trees can be found here.

Sources

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• 1977: Gary Chartrand: Introductory Graph Theory ... (previous) ... (next): $\S 4.1$: The Minimal Connector Problem: An Introduction to Trees