Geodesic
On approximation by families of linear polynomial operators in $l_P$-spaces, $0$
Sbornik. Mathematics, Tome 82 (1995) no. 2, pp. 441-459

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New applications are given for a method of approximation by families of linear polynomial operators in $L_p$-spaces with $0$ that was developed by the author in previous papers. In particular, a direct theorem and an inverse theorem on approximation 'by angle' of trigonometric polynomials are proved in the case of higher-order moduli of smoothness. 
@article{SM_1995_82_2_a11,
     author = {K. V. Runovskii},
     title = {On approximation by families of linear polynomial operators in $l_P$-spaces, $0<p<1$},
     journal = {Sbornik. Mathematics},
     pages = {441--459},
     publisher = {mathdoc},
     volume = {82},
     number = {2},
     year = {1995},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1995_82_2_a11/}
}
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K. V. Runovskii. On approximation by families of linear polynomial operators in $l_P$-spaces, $0