  Our original results refer to multivariate recurrences: discrete multitime
diagonal recurrence, bivariate recurrence, trivariate recurrence, solutions
tailored to particular situations, second order multivariate recurrences,
characteristic equation, and multivariate diagonal recurrences of superior
order. We find the solutions, we clarify the structural background and provides
short, conceptual proofs. The original results include a new point of view on
discrete minimal submanifolds.
