MathDB
Miklós Schweitzer 2007 Problem 6

Source:

March 3, 2017
Miklos Schweitzerset theory

Problem Statement

For which subsets ARA\subset \mathbb R is it true that whenever 0x0<x1<<xn10\leq x_0 < x_1 < \cdots < x_n\leq 1, n=1,2,n=1,2, \ldots, then there exist yjAy_j\in A numbers, such that yj+1yj>xj+1xjy_{j+1}-y_j>x_{j+1}-x_j for all 0j<n0\leq j < n.
(translated by Miklós Maróti)