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This article is cited in 5 scientific papers (total in 5 papers)
Multidimensional inequalities between distinct metrics in spaces with an asymmetric norm
A. I. Kozko M. V. Lomonosov Moscow State University
Abstract:
Jackson–Nikol'skii inequalities in the spaces $L_{p_1,p_2}(\mathbb T^d)$ and $L_{p_1,p_2}(\mathbb R^d)$ endowed with asymmetric norms are studied for trigonometric polynomials and entire functions of exponential type, respectively. It is shown that for any $d\in {\mathbb N}$, $\mathbf n\in {\mathbb N}^d$ and $p_1,p_2,q_1,q_2\in (0,\infty]$ a trigonometric polynomial $T_{\mathbf n}$ of degree $n_j$ in $x_j$ satisfies the inequality
$$
\|T_{\mathbf n}\|_{L_{q_1,q_2}(\mathbb T^d)}
\leqslant C_{p_1,p_2,q_1,q_2,d}\biggl (\prod ^d_{j=1}n_j\biggr )
^{\psi (p_1,p_2,q_1,q_2,d)}\|T_{\mathbf n}\|_{L_{p_1,p_2}(\mathbb T^d)},
$$
where $C_{p_1,p_2,q_1,q_2,d}$ is a constant independent of $\mathbf n$ and $\psi$ is an explicitly indicated function. Examples of polynomials show that this estimate is sharp in order. A similar result is obtained for functions of exponential type.
Received: 03.06.1996 and 02.06.1998
Citation:
A. I. Kozko, “Multidimensional inequalities between distinct metrics in spaces with an asymmetric norm”, Mat. Sb., 189:9 (1998), 85–106; Sb. Math., 189:9 (1998), 1361–1383
Linking options:
https://www.mathnet.ru/eng/sm348https://doi.org/10.1070/sm1998v189n09ABEH000348 https://www.mathnet.ru/eng/sm/v189/i9/p85
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Abstract page: | 525 | Russian version PDF: | 223 | English version PDF: | 19 | References: | 83 | First page: | 2 |
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