Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The index of singular integral operators with discontinuous oscillating
  coefficients   The article presents the procedure of the index calculation for the elements
of the algebra generated by one dimensional singular integral operators with
discontinuous oscillating coefficients.

18
The categories of this paper are: econ
0
The categories of this paper are: hep-ph
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio