Title
Fractional Cross Intersecting Families
Abstract
Let A = {A(1);...; A(p)} and B = {B-1;...; B-q} be two families of subsets of [n] such that for every i is an element of [p] and j is an element of [q], vertical bar A(i) boolean AND B-j vertical bar = c/d is an element of[0, 1] where is an irreducible fraction. We call such families c d-cross intersecting families. In this paper, we find a tight upper bound for the product vertical bar A vertical bar vertical bar B vertical bar and characterize the cases when this bound is achieved for c/d = 1/2. Also, we find a tight upper bound on vertical bar A vertical bar vertical bar B vertical bar when B is k-uniform and characterize, for all c d, the cases when this bound is achieved.
Year
DOI
Venue
2019
10.1007/s00373-020-02257-7
GRAPHS AND COMBINATORICS
Keywords
DocType
Volume
Cross-intersecting family, Fractional intersecting family, Linear code, Cross-bisecting family
Journal
37
Issue
ISSN
Citations 
2
0911-0119
0
PageRank 
References 
Authors
0.34
3
3
Name
Order
Citations
PageRank
Rogers Mathew18914.54
Ritabrata Ray200.34
Shashank Srivastava303.04