1 problem

Let $n_1,n_2\in\mathbb{Z}_{+}$, and let ${\mathcal{U}}^{\operatorname{row}}_{(n_1,n_2)}(l,u)$ and ${\mathcal{U}}^{\operatorname{col}}_{(n_1,n_2)}(l',u')$ denote the rank-one nonneg…