Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A uniform description of electromagnetism and wave mechanics   The paper shows the relationship between the major wave equations in quantum
mechanics and electromagnetism, such as Schroedinger's equation, Dirac's
equation and the Maxwell equations. It is shown that they can be derived in a
striking simple way from a common root. This root is the relativistic
fourvector formulation of the momentum conservation law. This is shown to be a
more attractive starting-point than Einstein's energy relationship for moving
particles, which is commonly used for the purpose. The theory developed gives a
new interpretation for the origin of antiparticles.

30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci