Emergent Mind
Improving Gebauer's construction of 3-chromatic hypergraphs with few edges
(2102.11674)
Published Feb 23, 2021
in
cs.DM
and
math.CO
Abstract
In 1964 Erd\H{o}s proved, by randomized construction, that the minimum number of edges in a $k$-graph that is not two colorable is $O(k2\; 2k)$. To this day, it is not known whether there exist such $k$-graphs with smaller number of edges. Known deterministic constructions use much larger number of edges. The most recent one by Gebauer requires $2{k+\Theta(k{2/3})}$ edges. Applying derandomization technique we reduce that number to $2{k+\widetilde{\Theta}(k{1/2})}$.
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