Geodesic
On the modulus of continuity of an operator of best approximation
Matematičeskie zametki, Tome 15 (1974) no. 5, pp. 797-808 
V. I. Berdyshev. On the modulus of continuity of an operator of best approximation. Matematičeskie zametki, Tome 15 (1974) no. 5, pp. 797-808. http://geodesic.mathdoc.fr/item/MZM_1974_15_5_a16/
@article{MZM_1974_15_5_a16,
     author = {V. I. Berdyshev},
     title = {On the modulus of continuity of an operator of best approximation},
     journal = {Matemati\v{c}eskie zametki},
     pages = {797--808},
     year = {1974},
     volume = {15},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1974_15_5_a16/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

In this paper we characterize spaces with an operator of best approximation uniformly continuous on a class of subspaces.