Equilateral sets in the ${\ell }_1$ sum of Euclidean spaces

Aaron Lin

Let $E^n$ denote the (real) $n$-dimensional Euclidean space. It is not known whether an equilateral set in the ${\ell }_1$ sum of $E^a$ and $E^b$, denoted here as $E^a{\oplus }_1{E}^b$,…