2 problems

Let $m$ be a positive integer, let $k\geq 1$, and let $q_1,\ldots,q_k>2$ be integers. Set … Here $\Delta_{\mathbb{C}}(m;q_1,\ldots,q_k)$ is the minimum dimension $d$ such that any…

Let $n$ be a positive integer, let $\mathbf{F}$ be the normalized $n\times n$ DFT matrix, and let $\mathsfsl{P}_\delta$ and $\mathsfsl{P}_\delta'$ denote the coordinate projections…