Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hydrodynamic approach justified for low-temperature transport in
  Ioffe-Regel limit metal   The highly disordered metals dropped into Ioffe-Regel transport regime at low
temperatures match unexpectedly the hydrodynamic criteria of the shortest
length scale entered the kinematic viscosity. Numerous hydrodynamic phenomena,
therefore, could be of reality in this case.

35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
14
The categories of this paper are: math-ph