Optimal approximate solutions and time scales. (English) Zbl 0322.34040
MSC:
34E05 | Asymptotic expansions of solutions to ordinary differential equations |
34A45 | Theoretical approximation of solutions to ordinary differential equations |
41A50 | Best approximation, Chebyshev systems |
41A60 | Asymptotic approximations, asymptotic expansions (steepest descent, etc.) |