Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: An extended Dirac equation in noncommutative space-time   Stabilizing, by deformation, the algebra of relativistic quantum mechanics a
non-commutative space-time geometry is obtained. The exterior algebra of this
geometry leads to an extended massless Dirac equation which has both a massless
and a large mass solution. The nature of the solutions is discussed, as well as
the effects of coupling the two solutions.

26
The categories of this paper are: bayes-an
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The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
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The categories of this paper are: eess
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The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
23
The categories of this paper are: solv-int