# isLeaf -- determines whether a vertex is a leaf

## Synopsis

• Usage:
l = isLeaf(G,v)
• Inputs:
• G, an instance of the type Graph,
• v, ,
• Outputs:
• l, , whether vertex v of graph G is a leaf

## Description

A vertex of a tree graph is a leaf if its degree is 1

 i1 : G = graph({{1,2},{1,3},{3,4},{3,5}},EntryMode=>"edges"); i2 : isLeaf(G,2) o2 = true

• isForest -- determines whether a graph is a forest
• isTree -- determines whether a graph is a tree
• leaves -- lists the leaves of a tree graph

## Ways to use isLeaf :

• "isLeaf(Graph,Thing)"

## For the programmer

The object isLeaf is .