Real matrices whose columns have equal modulus coordinates

Sara Botelho-Andrade, Peter G. Casazza, Desai Cheng +2

We study $m\times n$ matrices whose columns are of the form \[\{(a_{1j},\ldots, a_{nj}): \quad a_{1j} = λ_j,\ a_{ij} = \pmλ_j\ , \ λ_j >0 ,\ j=1,2,\ldots,n\}.\] We explicitly cons…