Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Equations of motion in odd-dimensional spaces and T-, C-invariance   The properties of the equation of Dirac type in three-dimensional and
five-dimensional Minkowski space-time with respect to time reflection (in sense
of Pauli and Wigner) as well as to the operation of charge conjugation are
investigated. P-, T-, C-invariance of Dirac equation for the cases of four
components (in three-dimentional space) and eight components (in
five-dimensional space) is established. Within the framework of the Poincare
group a relativistic equation is suggested wich describes the movement of a
particle with non-fixed (indefinite) mass in external electromagnetic field.

15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
37
The categories of this paper are: supr-con