Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Some preliminary observations on a defect Navier-Stokes system   Some implications of the simplest accounting of defects of compatibility in
the velocity field on the structure of the classical Navier-Stokes equations
are explored, leading to connections between classical elasticity, the elastic
theory of defects, plasticity theory, and classical fluid mechanics.

9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
32
The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio