Abstract A set S R is almost Erdős if, for every 0, there exists a set E R of positive Lebesgue measure such that \x S: ax+b E\ is nonempty for all |a| and b R. In this note, we show that any decreasing null sequence (xₙ) with decay rate greater than 1/2 is an almost Erdős set.
Arian Bërdëllima (Thu,) studied this question.