Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8903776 | Journal of Combinatorial Theory, Series A | 2018 | 39 Pages |
Abstract
We consider the action of the 2-dimensional projective special linear group PSL(2,q) on the projective line PG(1,q) over the finite field Fq, where q is an odd prime power. A subset S of PSL(2,q) is said to be an intersecting family if for any g1,g2âS, there exists an element xâPG(1,q) such that xg1=xg2. It is known that the maximum size of an intersecting family in PSL(2,q) is q(qâ1)/2. We prove that all intersecting families of maximum size are cosets of point stabilizers for all odd prime powers q>3.
Related Topics
Physical Sciences and Engineering
Mathematics
Discrete Mathematics and Combinatorics
Authors
Ling Long, Rafael Plaza, Peter Sin, Qing Xiang,