Definition:Rooted Tree/Root Node

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This page is about the root node of a rooted tree. For other uses, see Definition:Root.


Let $T$ be a rooted tree.

The root node of $T$ is the node of $T$ which is distinguished from the others by being the ancestor node of every node of $T$.

Also known as

The root node of a rooted tree can be referred to as just the root.