2 problems

Let $m$ denote the number of Fourier modes in the periodic potentials, let $n$ be the ambient dimension, and let $V_1,V_2$ be smooth periodic functions. The rigidity result referre…

Assume that $H(p)=\varphi(|p|)$, where $\varphi:[0,\infty)\to\mathbb{R}$ satisfies (H7), and let … be the associated sequence, with $M_i=\varphi(s_{2i-1})$ and…