Erdős-Ko-Rado theorems for ovoidal circle geometries and polynomials over finite fields

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Abstract

In this paper we investigate Erdős-Ko-Rado theorems in ovoidal circle geometries. We prove that in Möbius planes of even order greater than 2, and ovoidal Laguerre planes of odd order, the largest families of circles which pairwise intersect in at least one point, consist of all circles through a fixed point. In ovoidal Laguerre planes of even order, a similar result holds, but there is one other type of largest family of pairwise intersecting circles. As a corollary, we prove that the largest families of polynomials over GF(q) of degree at most k, with 2 <= k <= q, which pairwise take the same value on at least one point, consist of all polynomials f of degree at most k such that f(x)=y for some fixed x and y in GF(q). We also discuss this problem for ovoidal Minkowski planes, and we investigate the largest families of circles pairwise intersecting in two points in circle geometries.
Original languageEnglish
Pages (from-to)1-38
Number of pages38
JournalLinear Algebra and its Applications
Volume643
DOIs
Publication statusPublished - 15 Jun 2022

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