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The existence of designs

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arxiv 1401.3665 v4 pith:45CT4U6C submitted 2014-01-15 math.CO

The existence of designs

classification math.CO
keywords existencecliquedesignsansweringassumingcertaincombinatorialcomplexes
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We prove the existence conjecture for combinatorial designs, answering a question of Steiner from 1853. More generally, we show that the natural divisibility conditions are sufficient for clique decompositions of simplicial complexes that satisfy a certain pseudorandomness condition. As a further generalisation, we obtain the same conclusion only assuming an extendability property and the existence of a robust fractional clique decomposition.

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Cited by 12 Pith papers

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