Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On estimates of the order of approximation of functions of several
  variables in the anisotropic Lorentz-Karamata space   In this paper we consider anisotropic Lorentz-Karamata space $2\pi$ of
periodic functions of $m$ variables and Nikol'skii--Besov's class . In this
paper, we establish order-sharp estimates of the best approximation by
trigonometric polynomials with harmonic numbers from the step hyperbolic cross
of functions from the Nikol'skii - Besov class in the norm of the anisotropic
Lorentz-Karamata space.

17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
22
The categories of this paper are: chao-dyn
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol