Equilateral sets in uniformly smooth Banach spaces

Abstract

Let $X$ be an infinite dimensional uniformly smooth Banach space. We prove that $X$ contains an infinite equilateral set. That is, there exists a constant $λ>0$ and an infinite sequence $(x_i)_{i=1}^\infty\subset X$ such that $\|x_i-x_j\|=λ$ for all $i\neq j$.

11 pages