# closedNeighborhood -- Returns the closed neighborhood of a vertex of a graph

## Synopsis

• Usage:
N = closedNeighborhood(G,v)
• Inputs:
• G, an instance of the type Graph,
• v, ,
• Outputs:
• N, a list, The closed neighborhood of vertex v in graph G

## Description

The closed neighborhood of a vertex v just the union of the open neighborhood (or neighbors) of v and the vertex v itself

 i1 : G = cycleGraph 4; i2 : closedNeighborhood(G,2) o2 = set {1, 2, 3} o2 : Set