Geodesic
On Jackson inequality in $L_p(\mathbb T^d)$
Fundamentalʹnaâ i prikladnaâ matematika, Tome 1 (1995) no. 3, pp. 753-766 
A. V. Rozhdestvenskii. On Jackson inequality in $L_p(\mathbb T^d)$. Fundamentalʹnaâ i prikladnaâ matematika, Tome 1 (1995) no. 3, pp. 753-766. http://geodesic.mathdoc.fr/item/FPM_1995_1_3_a11/
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     title = {On {Jackson} inequality in $L_p(\mathbb T^d)$},
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Voir la notice de l'article provenant de la source Math-Net.Ru

The author proved some necessary and sufficient conditions on a finite set of $d$–dimensional vectors $\{\alpha_l\}$, when Jackson–Youdin inequality for the approximation of periodic function $f$ by trigonometric polynomials: $$ E_{n-1}(f)_q\le A\cdot n^{-r +(d/p-d/q)_+}\cdot \max\limits_{l}\|\Delta_{2\pi\alpha_l/n}^m f^{(r)}\|_p, $$ where $A>0$ is independent of $f$ and $n$, holds. A criterion of solvability of the homological equation $$ f(x)-\frac{1}{(2\pi)^d}\int f(t)dt=\varphi(x+2\pi\alpha)-\varphi(x)\qquada.e.\ x $$ on the sets of functions $\{f\colon\ f^{(r)}\in L_p(\mathbb T^d)\}$ is obtained.

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