2 problems

Let $f$ be $n$-nondegenerate when the set … is dense in $\mathbb R^n$. In the lattice model, suppose that $d^2U^{(2)}/dq^2$ is $n$-nondegenerate for $n$ sufficiently large, where h…

Let … by $/$ in the interaction parameter, and let $(k)$ be the dispersion relation whose square is the Fourier transform of the lattice operator $2(-\Delta+1)$. For macroscopic va…