Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Steen-Ermakov-Pinney equation and integrable nonlinear deformation of
  one-dimensional Dirac equation   The paper deals with nonlinear one-dimensional Dirac equation. We describe
its invariants set by means of the deformed linear Dirac equation, using the
fact that two ordinary differential equations are equivalent if their sets of
invariants coincide.

17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat