On regular 3-wise intersecting families

Author:

Frankston Keith,Kahn Jeff,Narayanan Bhargav

Abstract

Ellis and the third author showed, verifying a conjecture of Frankl, that any 3 3 -wise intersecting family of subsets of { 1 , 2 , , n } \{1,2,\dots ,n\} admitting a transitive automorphism group has cardinality o ( 2 n ) o(2^n) , while a construction of Frankl demonstrates that the same conclusion need not hold under the weaker constraint of being regular. Answering a question of Cameron, Frankl, and Kantor from 1989, we show that the restriction of admitting a transitive automorphism group may be relaxed significantly: we prove that any 3 3 -wise intersecting family of subsets of { 1 , 2 , , n } \{1,2,\dots ,n\} that is regular and increasing has cardinality o ( 2 n ) o(2^n) .

Funder

National Science Foundation

Publisher

American Mathematical Society (AMS)

Subject

Applied Mathematics,General Mathematics

Reference15 articles.

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4. D. Ellis, G. Kalai, and B. Narayanan, On symmetric intersecting families, preprint, arXiv:1702.02607.

5. On symmetric 3-wise intersecting families;Ellis, David;Proc. Amer. Math. Soc.,2017

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