cliqueNumber -- computes the clique number of a graph

• Usage:

  c = cliqueNumber G

• Inputs:
  • G, a graph,
• Outputs:
  • c, an integer, the clique number of G

i1 : R = QQ[a..d];

i2 : cliqueNumber completeGraph R

o2 = 4

i3 : G = graph({a*b,b*c,a*c,a*d})

o3 = Graph{"edges" => {{a, b}, {a, c}, {b, c}, {a, d}}}
           "ring" => R
           "vertices" => {a, b, c, d}

o3 : Graph

i4 : cliqueNumber G

o4 = 3

i5 : dim cliqueComplex G + 1 == cliqueNumber G

o5 = true