# Category:Descendant Nodes

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This category contains results about **Descendant Nodes**.

Definitions specific to this category can be found in Definitions/Descendant Nodes.

Let $T$ be a rooted tree with root $r_T$.

Let $t$ be a node of $T$.

A **descendant node** $s$ of a $t$ is a node such that $t$ is in the path from $s$ to $r_T$.

That is, the **descendant nodes** of $t$ are all the **nodes** of $T$ of which $t$ is an ancestor node.