Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Aspects of the Tetrahedral Neutrino Mass Matrix   The four-parameter tetrahedral neutrino mass matrix introduced earlier by the
author is studied in two specific limits, both having only two parameters and
resulting in theta_13=0, theta_23=pi/4, and tan^2 theta_12=1/2. One limit
corresponds to a recent proposal which predicts a normal ordering of neutrino
masses; the other is new and allows both inverted and normal ordering.

17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
18
The categories of this paper are: econ
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
34
The categories of this paper are: chem-ph
5
The categories of this paper are: gr-qc
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
6
The categories of this paper are: astro-ph