Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the differential smoothness of 3-dimensional skew polynomial algebras
  and diffusion algebras   In this paper, we study the differential smoothness of 3-dimensional skew
polynomial algebras and diffusion algebras.

16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
6
The categories of this paper are: astro-ph
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin