leaf node (of a tree)

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A leaf of a tree is any node which has degree of exactly 1. Put another way, a leaf node of a rooted tree is any node which has no child nodes.

\\xymatrix{&\\bullet\\ar@{-}[dl]\\ar@{-}[dr]&&&\\inner@par{\\color[rgb]{1,0,0}%\\bullet}&&\\bullet\\ar@{-}[dr]\\ar@{-}[dl]&&\\inner@par&\\bullet\\ar@{-}[dl]&&{%\\color[rgb]{1,0,0}\\bullet}&\\inner@par{\\color[rgb]{1,0,0}\\bullet}&&&&}

Figure: A tree with leaf nodes highlighted in red.

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