Title
On L-Close Sperner Systems
Abstract
For a set L of positive integers, a set system F subset of 2([n]) is said to be L-close Sperner, if for any pair F, G of distinct sets in F the skew distance sd(F, G) = min{vertical bar F\G vertical bar,vertical bar G\F vertical bar} belongs to L. We reprove an extremal result of Boros, Gurvich, and Milanic on the maximum size of L-close Sperner set systems for L = {1}, generalize it to vertical bar L vertical bar = 1, and obtain slightly weaker bounds for arbitrary L. We also consider the problem when L might include 0 and reprove a theorem of Frankl, Furedi, and Pach on the size of largest set systems with all skew distances belonging to L = {0,1}.
Year
DOI
Venue
2021
10.1007/s00373-021-02280-2
GRAPHS AND COMBINATORICS
Keywords
DocType
Volume
Extremal set systems, Sperner type theorems, Polynomial method
Journal
37
Issue
ISSN
Citations 
3
0911-0119
0
PageRank 
References 
Authors
0.34
0
2
Name
Order
Citations
PageRank
Dániel T. Nagy102.37
Balázs Patkós200.34