Geodesic
Direct and converse theorems of the theory of approximation in the metric of $L_p$ for $0$
Matematičeskie zametki, Tome 18 (1975) no. 5, pp. 641-658

Voir la notice de l'article provenant de la source Math-Net.Ru

A direct theorem of the Jackson type and several converse theorems are established for the approximation of periodic functions of period $2\pi$ by trigonometrical polynomials in the metric of $L_p$, $0$. 
@article{MZM_1975_18_5_a1,
     author = {V. I. Ivanov},
     title = {Direct and converse theorems of the theory of approximation in the metric of $L_p$ for $0<p<1$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {641--658},
     publisher = {mathdoc},
     volume = {18},
     number = {5},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1975_18_5_a1/}
}
TY  - JOUR
AU  - V. I. Ivanov
TI  - Direct and converse theorems of the theory of approximation in the metric of $L_p$ for $0
JO  - Matematičeskie zametki
PY  - 1975
SP  - 641
EP  - 658
VL  - 18
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1975_18_5_a1/
LA  - ru
ID  - MZM_1975_18_5_a1
ER  - 
%0 Journal Article
%A V. I. Ivanov
%T Direct and converse theorems of the theory of approximation in the metric of $L_p$ for $0
%J Matematičeskie zametki
%D 1975
%P 641-658
%V 18
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZM_1975_18_5_a1/
%G ru
%F MZM_1975_18_5_a1
V. I. Ivanov. Direct and converse theorems of the theory of approximation in the metric of $L_p$ for $0