Explicit formulas for arithmetic support of differential and difference operators

Maxim Kontsevich, Alexander Odesskii

We compute arithmetic support of the formal deformations $D=P+t{Q}_1+t^2{Q}_2+...$ of the differential operator $P=(x{\partial }_x-r_1)...(x{\partial }_x-r_k)$, where $r_1,...,r_k\in\mathbb{…