Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: One-dimensional model equations for hyperbolic fluid flow   In this paper we study the singularity formation for two nonlocal 1D active
scalar equations, focusing on the hyperbolic flow scenario. Those 1D equations
can be regarded as simplified models of some 2D fluid equations.

15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
24
The categories of this paper are: dg-ga
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con