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Calculating the maximum number of maximum cliques for simple graphs

Abstract

A simple graph on nn vertices may contain a lot of maximum cliques. But how many can it potentially contain? We will define prime and composite graphs, and we will show that if n15n \ge 15, then the grpahs with the maximum number of maximum cliques have to be composite. Moreover, we will show an edge bound from which we will prove that if any factor of a composite graph has ω(Gi)5\omega(G_i) \ge 5, then it cannot have the maximum number of maximum cliques. Using this we will show that the graph that contains 3n/3c3^{\lfloor n/3 \rfloor}c maximum cliques has the most number of maximum cliques on nn vertices, where c{1,43,2}c\in\{1,\frac{4}{3},2\}, depending on n mod 3n \text{ mod } 3.

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