A note on the strong de la Vallé Poussin approximation. (English) Zbl 0857.42018
The author extends his own result on strong approximation [Acta Sci. Math. 32, 41-50 (1971; Zbl 0214.08102)] to very strong approximation.
MSC:
42C15 | General harmonic expansions, frames |
41A30 | Approximation by other special function classes |