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34-XX - Ordinary differential equations [MSC 2020] |
34A45 - Theoretical approximation of solutions [MSC 2020] |
35-XX - Partial differential equations [MSC 2020] |
35A35 - Theoretical approximation in context of PDEs [MSC 2020] |
41-XX - Approximations and expansions [MSC 2020] |
41A65 - Abstract approximation theory (approximation in normed linear spaces and other abstract spaces) [MSC 2020] |
45Lxx - Theoretical approximation of solutions to integral equations [MSC 2020] |