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Date: 24-3-2022
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Date: 6-8-2016
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Date: 6-5-2022
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The clique polynomial for the graph
is defined as the polynomial
(1) |
where is the clique number of
, the coefficient of
for
is the number of cliques
in a graph with
vertices, and the constant term is 1 (Hoede and Li 1994, Hajiabolhassan and Mehrabadi 1998). Hajiabolhassan and Mehrabadi (1998) showed that
always has a real root.
The coefficient is the vertex count,
is the edge count, and
is the triangle count in a graph.
is related to the independence polynomial by
(2) |
where denotes the graph complement (Hoede and Li 1994).
This polynomial is similar to the dependence polynomial defined as
(3) |
(Fisher and Solow 1990), with the two being related by
(4) |
The following table summarizes clique polynomials for some common classes of graphs.
graph | |
Andrásfai graph |
|
antiprism graph | |
barbell graph | |
book graph |
|
cocktail party graph |
|
complete bipartite graph |
|
complete graph |
|
complete tripartite graph |
|
crossed prism graph | |
crown graph | |
cycle graph |
|
empty graph |
|
folded cube graph | |
gear graph | |
grid graph |
|
grid graph |
|
helm graph | |
hypercube graph |
|
ladder graph |
|
ladder rung graph |
|
Möbius ladder |
|
path graph |
|
prism graph |
|
star graph |
|
sun graph | |
sunlet graph |
|
transposition graph | |
triangular grid graph | |
web graph for |
|
wheel graph |
The following table summarizes the recurrence relations for clique polynomials for some simple classes of graphs.
graph |
order | recurrence |
Andrásfai graph |
4 | |
barbell graph | 2 | |
book graph |
2 | |
cocktail party graph |
1 | |
complete bipartite graph |
3 | |
complete graph |
1 | |
2 | ||
crown graph | 3 | |
cycle graph |
2 | |
empty graph |
2 | |
folded cube graph | 3 | |
gear graph | 2 | |
grid graph |
3 | |
grid graph |
4 | |
hypercube graph |
3 | |
3 | ||
3 | ||
ladder graph |
2 | |
ladder rung graph |
2 | |
Möbius ladder |
2 | |
path graph |
2 | |
prism graph |
2 | |
star graph |
2 | |
sun graph | 3 | |
sunlet graph |
2 | |
triangular grid graph | 3 | |
wheel graph |
2 |
REFERENCES
Fisher, D. C. and Solow, A. E. "Dependence Polynomials." Disc. Math. 82, 251-258, 1990
.Goldwurm, M. and Santini, M. "Clique Polynomials Have a Unique Root of Smallest Modulus." Informat. Proc. Lett. 75, 127-132, 2000.
Hajiabolhassan, H. and Mehrabadi, M. L. "On Clique Polynomials." Australas. J. Combin. 18, 313-316, 1998.
Hoede, C. and Li, X. "Clique Polynomials and Independent Set Polynomials of Graphs." Discr. Math. 125, 219-228, 1994.
Levit, V. E. and Mandrescu, E. "The Independence Polynomial of a Graph--A Survey." In Proceedings of the 1st International Conference on Algebraic Informatics. Held in Thessaloniki, October 20-23, 2005
(Ed. S. Bozapalidis, A. Kalampakas, and G. Rahonis). Thessaloniki, Greece: Aristotle Univ., pp. 233-254, 2005.
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