Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Some Exact Solutions to Equations of Motion of an Incompressible Third
  Grade Fluid   This investigation deals with some exact solutions of the equations governing
the steady plane motions of an incompressible third grade fluid by using
complex variables and complex functions. Some of the solutions admit, as
particular cases, all the solutions of Moro et al[1].

0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
8
The categories of this paper are: hep-ex