On the Neumann Problem for some Linear and Non-linear Uniformly Elliptic Difference Equations

In this paper we obtain a priori bounds on difference quotientsto the solution of the second boundary value problem for somelinear uniformly elliptic difference equations over rectangularregions. These results are applied to the constructive solutionof mildly non-linear and mildly quasi-linear uniformly ellipticdifference equations.