COCONVEX APPROXIMATION OF FUNCTIONS OF SEVERAL VARIABLES BY POLYNOMIALS

1982 ◽  
Vol 43 (4) ◽  
pp. 515-526
Author(s):  
A S Švedov
Keyword(s):  
Approximation Of Functions ◽  
Several Variables ◽  
Coconvex Approximation

scholarly journals Approximation characteristics of the isotropic Nikol'skii-Besov functional classes

2021 ◽  
Vol 13 (3) ◽  
pp. 851-861
Author(s):  
S.Ya. Yanchenko ◽  
O.Ya. Radchenko
Keyword(s):  
Exponential Type ◽  
Lebesgue Space ◽  
Entire Functions ◽  
Exact Order ◽  
Periodic Functions ◽  
Approximation Of Functions ◽  
Several Variables ◽  
Functions Of Exponential Type ◽  
Functional Classes ◽  
Mixed Smoothness

In the paper, we investigates the isotropic Nikol'skii-Besov classes $B^r_{p,\theta}(\mathbb{R}^d)$ of non-periodic functions of several variables, which for $d = 1$ are identical to the classes of functions with a dominant mixed smoothness $S^{r}_{p,\theta}B(\mathbb{R})$. We establish the exact-order estimates for the approximation of functions from these classes $B^r_{p,\theta}(\mathbb{R}^d)$ in the metric of the Lebesgue space $L_q(\mathbb{R}^d)$, by entire functions of exponential type with some restrictions for their spectrum in the case $1 \leqslant p \leqslant q \leqslant \infty$, $(p,q)\neq \{(1,1), (\infty, \infty)\}$, $d\geq 1$. In the case $2<p=q<\infty$, $d=1$, the established estimate is also new for the classes $S^{r}_{p,\theta}B(\mathbb{R})$.

A problem of best approximation of functions of several variables

1982 ◽  
Vol 32 (5) ◽  
pp. 845-848
Author(s):  
N. V. Miroshin ◽  
V. V. Khromov
Keyword(s):  
Best Approximation ◽  
Approximation Of Functions ◽  
Several Variables
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