Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Volkov solution for an electron in the two wave fields   It is considered the Dirac equation with two different four-potentials of the
plane electromagnetic waves. We derive the equation for the wave function which
is generalized form of the Volkov equation. We find the solutions of the Dirac
equation for two orthogonal waves. We determine the modified Compton formula
for the scattering of two photons on an electron.

6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
2
The categories of this paper are: math
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom