Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the nonrelativistic limit of a semilinear field equation in a uniform
  and isotropic space   The nonrelativistic limit of a semilinear field equation is considered in a
uniform and isotropic space.The scale-function of the space is constructed
based on the Einstein equation.The Cauchy problem of the limit-equation is
considered,and global and blow-up solutions are shown in Sobolev spaces. The
role of spatial variance on the problem is studied,and some dissipative
properties of the limit-equation are remarked.

7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
13
The categories of this paper are: quant-ph
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
37
The categories of this paper are: supr-con