MarceloSales

A subset $A\subseteq \mathbb{Z}$ of integers is free if for every two distinct subsets $B,B^{\prime }\subseteq A$ we have \Pisier asked if for every subset $A\subseteq \mathbb{Z}$ of integers the following two statement are equivalent: (i) $A$ is a union of finitely many free sets. (ii) There exists $ϵ>0$ such that every finite …