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Paper detail

Lagrangians of Hypergraphs II: When colex is best

A well-known conjecture of Frankl and Füredi from 1989 states that an initial segment of colex of has the largest Lagrangian of any $r$-uniform hypergraph with $m$ hyperedges. We show that this is true when $r=3$. We also give a new proof of a related conjecture of Nikiforov and a counterexample to an old conjecture of Ahlswede and Katona.

preprint2020arXivOpen access
Vytautas GruslysShoham LetzterNatasha Morrison
math.CO
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Vytautas GruslysShoham LetzterNatasha Morrison

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