Characterization of the smoothness of functions with a given order of approximation by polynomials on the real line

Instytut Matematyczny Polskiej Akademii Nauk / Institute of Mathematics / Publishing house / Banach Center Publications / All volumes

V. M. Fedorov Banach Center Publications 22 (1989), 119-129 DOI: 10.4064/-22-1-119-129