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We prove that among all flag triangulations of manifolds of odd dimension
, with a sufficient number of vertices, the unique maximizer of the entries of the
-vector is the balanced join of
cycles. Our proof uses methods from extremal graph theory.
A graph H is called common if the sum of the number of copies of H in a graph G and the number in the complement of G is asymptotically minimized by taking G to be a random graph. Extending a conjecture of Erdős, Burr and Rosta conjectured that every graph is common. Thomason disproved both conjectures by showing that K4 is not common. It is now known that in fact the common graphs are very rare. Answering a question of Sidorenko and of Jagger, Št'ovíček and Thomason from 1996 we show that the 5-wheel is common. This provides the first example of a common graph that is not three-colourable.
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