# vertices(HyperGraph) -- gets the vertices of a (hyper)graph

## Synopsis

• Function: vertices
• Usage:
V = vertices(H)
• Inputs:
• H, , the input
• Outputs:
• V, a list, of the vertices of H

## Description

This function takes a graph or hypergraph and returns the vertex set of the graph.

 i1 : S = QQ[a..d]; i2 : g = graph {a*b,b*c,c*d,d*a} -- the four cycle o2 = Graph{edges => {{a, b}, {b, c}, {a, d}, {c, d}}} ring => S vertices => {a, b, c, d} o2 : Graph i3 : vertices g o3 = {a, b, c, d} o3 : List i4 : h = hyperGraph{a*b*c} o4 = HyperGraph{edges => {{a, b, c}} } ring => S vertices => {a, b, c, d} o4 : HyperGraph i5 : vertices h -- the vertex d is treated as an isolated vertex o5 = {a, b, c, d} o5 : List