Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Steady free fall of one-dimensional bodies in a hyperviscous fluid at
  low Reynolds number   The paper is devoted to the study of the motion of one-dimensional rigid
bodies during a free fall in a quasi-Newtonian hyperviscous fluid at low
Reynolds number. We show the existence of a steady solution and furnish
sufficient conditions on the geometry of the body in order to get purely
translational motions. Such conditions are based on a generalized version of
the so-called Reciprocal Theorem for fluids.

28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
13
The categories of this paper are: quant-ph
4
The categories of this paper are: cond-mat
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin