Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Mass of the Neutrinos   In the theory of the Dirac equation and in the standard model, the neutrino
is massless. Both these theories use Lorentz invariance. In modern approaches
however, spacetime is no longer smooth, and this modifies special relativity.
We show how such a modification throws up the mass of the (electron) neutrino.

19
The categories of this paper are: eess
18
The categories of this paper are: econ
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
26
The categories of this paper are: bayes-an