Periodic elliptic operators with asymptotically preassigned spectrum

Andrii Khrabustovskyi

We deal with operators in ${\mathbb{R}}^n$ of the form $$\mathbf{A}=-{1\over \mathbf{b}(x)}\sum\limits_{k=1}^n\ds{\partial\over\partial x_k}(\mathbf{a}(x){\partial \over\partial x_k}…