Discretization of solutions of partial differential equations in the context of the Computational (numerical) diameter

Since 1996, the idea of a Computational (numerical) diameter has been consistently developed, the goal of which is to optimally computer process models of mathematical models in real conditions of distorted data. The C(N)D-scheme, in our opinion, determines the refined organization of research in Approximation theory, Computational mathematics, and Numerical analysis. The paper is devoted to the coverage of the C(N)D -approach in the theory of partial differential equations. The examples of the historically original Laplace, Poisson, heat conduction, wave and, relatively recently Klein-Gordon equations give theorems as illustrative results of the quality and efficiency of C(N)D-productions. The presented materials can serve to continue the study of the optimal discretization of solutions of partial differential equations with further expansion and deepening of the proposed direction.