Über eine Eigenschaft der linearen Mittel einer Fourierreihe. (Russian) Zbl 0324.42001
MSC:
| 42A10 | Trigonometric approximation |
| 42-00 | General reference works (handbooks, dictionaries, bibliographies, etc.) pertaining to harmonic analysis on Euclidean spaces |
| 41A10 | Approximation by polynomials |
| 41A35 | Approximation by operators (in particular, by integral operators) |
| 41A50 | Best approximation, Chebyshev systems |
