Abstract
We study the structure of r-uniform hypergraphs containing no Berge cycles of length at least k for k≤r, and determine that such hypergraphs have some special substructure. In particular we determine the extremal number of such hypergraphs, giving an affirmative answer to the conjectured value when k=r and giving a simple solution to a recent result of Kostochka-Luo when k<r.
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