Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On atmospheric neutrino mass-squared difference in the precision era   With the measurement of the small parameter $\sin^{2}\theta_{13}$ experiments
on the study of neutrino oscillations enter into a high precision era. I
discuss here the problem of the definition of the atmospheric mass-squared
difference which will be important for analysis of data of future experiments.

21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
33
The categories of this paper are: plasm-ph
4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ