TY  - JOUR
TI  - On the Partial Difference Equations of Mathematical Physics
AU  - Richard Courant
AU  - Kurt Friedrichs
AU  - Hans Lewy
PY  - 1967
JO  - IBM Journal of Research and Development
DO  - 10.1147/rd.112.0215
UR  - https://doi.org/10.1147/rd.112.0215
AB  - Problems involving the classical linear partial differential equations of mathematical physics can be reduced to algebraic ones of a very much simpler structure by replacing the differentials by difference quotients on some (say rectilinear) mesh. This paper will undertake an elementary discussion of these algebraic problems, in particular of the behavior of the solution as the mesh width tends to zero. For present purposes we limit ourselves mainly to simple but typical cases, and treat them in such a way that the applicability of the method to more general difference equations and to those with arbitrarily many independent variables is made clear.
ER  -