On a class of rational matrices and interpolating polynomials related to the discrete Laplace operator

Pierpaolo Vivo, Mario Casartelli, Luca Dall'Asta +1

Let $\dlap$ be the discrete Laplace operator acting on functions (or rational matrices) $f:{\mathbf{Q}}_L\to \mathbb{Q}$, where ${\mathbf{Q}}_L$ is the two dimensional lattice of size $…