Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Additional Equations Derived from the Ryder Postulates in the
  (1/2,0)+(0,1/2) Representation of the Lorentz Group   Developing recently proposed constructions for the description of particles
in the $(1/2,0)\oplus (0,1/2)$ representation space, we derive the second-order
equations. The similar ones were proposed in the sixties and the seventies in
order to understand the nature of various mass and spin states in the
representations of the $O(4,2)$ group. We give some additional insights into
this problem. The used procedure can be generalized for {\it arbitrary} number
of lepton families.

18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
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The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
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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
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom