Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fermion mass and the pressure of dense matter   We consider a simple toy model to study the effects of finite fermion masses
on the pressure of cold and dense matter, with possible applications in the
physics of condensates in the core of neutron stars and color
superconductivity.

9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
33
The categories of this paper are: plasm-ph
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
37
The categories of this paper are: supr-con