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Non-bipartite k-common graphs

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arxiv 2006.09422 v7 pith:OVLJDIRV submitted 2020-06-16 math.CO

classification math.CO
keywords k-commoneverygraphlocallynon-bipartiteonlysidorenkoasymptotically
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A graph H is k-common if the number of monochromatic copies of H in a k-edge-coloring of K_n is asymptotically minimized by a random coloring. For every k, we construct a connected non-bipartite k-common graph. This resolves a problem raised by Jagger, Stovicek and Thomason [Combinatorica 16 (1996), 123-141]. We also show that a graph H is k-common for every k if and only if H is Sidorenko and that H is locally k-common for every k if and only if H is locally Sidorenko.

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