Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A Classification and Examples of Four-Dimensional Nonisoclinic
  Three-Webs   A classification and examples of four-dimensional isoclinic three-webs of
codimension two are given. The examples considered prove the existence theorem
for many classes of webs for which the general existence theorems are not
proved yet.

12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
36
The categories of this paper are: cmp-lg