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Set Systems and Families of Permutations with Small Traces

Identifieur interne : 003C39 ( Main/Exploration ); précédent : 003C38; suivant : 003C40

Set Systems and Families of Permutations with Small Traces

Auteurs : Otfried Cheong [Corée du Sud] ; Xavier Goaoc [France] ; Cyril Nicaud [France]

Source :

RBID : Hal:inria-00441376

Descripteurs français

Abstract

We study the maximum size of a set system on $n$ elements whose trace on any $b$ elements has size at most $k$. We show that if for some $b \ge i \ge 0$ the shatter function $f_R$ of a set system $([n],R)$ satisfies $f_R(b) < 2^i(b-i+1)$ then $|R| = O(n^i)$; this generalizes Sauer's Lemma on the size of set systems with bounded VC-dimension. We use this bound to delineate the main growth rates for the same problem on families of permutations, where the trace corresponds to the inclusion for permutations. This is related to a question of Raz on families of permutations with bounded VC-dimension that generalizes the Stanley-Wilf conjecture on permutations with excluded patterns.

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Le document en format XML

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<li>Université de Lorraine</li>
</orgName>
</list>
<tree>
<country name="Corée du Sud">
<noRegion>
<name sortKey="Cheong, Otfried" sort="Cheong, Otfried" uniqKey="Cheong O" first="Otfried" last="Cheong">Otfried Cheong</name>
</noRegion>
</country>
<country name="France">
<region name="Grand Est">
<name sortKey="Goaoc, Xavier" sort="Goaoc, Xavier" uniqKey="Goaoc X" first="Xavier" last="Goaoc">Xavier Goaoc</name>
</region>
<name sortKey="Nicaud, Cyril" sort="Nicaud, Cyril" uniqKey="Nicaud C" first="Cyril" last="Nicaud">Cyril Nicaud</name>
</country>
</tree>
</affiliations>
</record>

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