Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: How to Describe Neutrino Mixing and CP Violation   We present a classification of possible parametrizations of the 3x3 lepton
flavor mixing matrix in terms of the rotation and phase angles. A particular
parametrization, which is most convenient to describe the observables of
neutrino oscillations and that of the neutrinoless double beta decay, is
studied in detail. The possibility to determine the Dirac- and Majorana-type
CP-violating phases are also discussed.

36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat