On solutionfree sets of integers
Abstract
Given a linear equation $\mathcal{L}$, a set $A \subseteq [n]$ is $\mathcal{L}$free if $A$ does not contain any `nontrivial' solutions to $\mathcal{L}$. In this paper we consider the following three general questions: (i) What is the size of the largest $\mathcal{L}$free subset of $[n]$? (ii) How many $\mathcal{L}$free subsets of $[n]$ are there? (iii) How many maximal $\mathcal{L}$free subsets of $[n]$ are there? We completely resolve (i) in the case when $\mathcal{L}$ is the equation $px+qy=z$ for fixed $p,q\in \mathbb N$ where $p\geq 2$. Further, up to a multiplicative constant, we answer (ii) for a wide class of such equations $\mathcal{L}$, thereby refining a special case of a result of Green. We also give various bounds on the number of maximal $\mathcal{L}$free subsets of $[n]$ for threevariable homogeneous linear equations $\mathcal{L}$. For this, we make use of container and removal lemmas of Green.
 Publication:

arXiv eprints
 Pub Date:
 July 2016
 arXiv:
 arXiv:1607.08399
 Bibcode:
 2016arXiv160708399H
 Keywords:

 Mathematics  Combinatorics;
 Mathematics  Number Theory;
 11B75;
 05C69
 EPrint:
 20 pages, final version. To appear in European Journal of Combinatorics