Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the exact constant in Jackson-Stechkin inequality for the uniform
  metric   The classical Jackson-Stechkin inequality estimates the value of the best
uniform approximation of a periodic function by trigonometric polynomials of
degree $\le n-1$ in terms of its $r$-th modulus of smoothness
$\omega_r(f,\delta)$.
  The main result of the paper is in establishing the correct order of
Jackson--Stechkin constants.

35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
3
The categories of this paper are: physics