2 problems

Let $W$ be the hypersurface and let $\varphi$ be a plurisubharmonic weight for which the upper density $D^+_{\varphi}(W)$ is defined. The theorem asserting the relevant Bargmann–Fo…

Gröchenig–Lyubarskii conjecture. For a lattice $\Lambda$ in $\mathbb{R}^2$, the existence of a Gabor frame generated by $h_n$ should force its Beurling density to satisfy…