Abstract
We investigate a basic problem in combinatorial property testing, in the sense of Goldreich, Goldwasser, and Ron [9,10], in the context of 3-uniform hypergraphs, or 3-graphs for short. As customary, a 3-graph F is simply a collection of 3-element sets. Let Forbind(n, F) be the family of all 3-graphs on n vertices that contain no copy of F as an induced subhypergraph. We show that the property “H ∈ Forbind(n, F)” is testable, for any 3-graph F. In fact, this is a consequence of a new, basic combinatorial lemma, which extends to 3-graphs a result for graphs due to Alon, Fischer, Krivelevich, and Szegedy [2,3].
Indeed, we prove that if more than ξn 3 (V > 0) triples must be added or deleted from a 3-graph H on n vertices to destroy all induced copies of F, then H must contain ≥ cn |V(F)| induced copies of F, as long as n ≥ n 0(ξ, F). Our approach is inspired in [2,3], but the main ingredients are recent hypergraph regularity lemmas and counting lemmas for 3-graphs.
Partially supported by MCT/CNPq through ProNEx Programme (Proc. CNPq 664107/1997-4), by CNPq (Proc. 300334/93-1, 910064/99-7, and 468516/2000-0).
Partially supported by NSF Grant INT-0072064.
Partially supported by NSF Grants 0071261 and INT-0072064.
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Kohayakawa, Y., Nagle, B., Rödl, V. (2002). Efficient Testing of Hypergraphs. In: Widmayer, P., Eidenbenz, S., Triguero, F., Morales, R., Conejo, R., Hennessy, M. (eds) Automata, Languages and Programming. ICALP 2002. Lecture Notes in Computer Science, vol 2380. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45465-9_87
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DOI: https://doi.org/10.1007/3-540-45465-9_87
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