Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: When did the Large Elliptical Galaxies Form?   The simple reading of the evidence is that the large elliptical galaxies
existed at about the present star mass and comoving number density at redshift
z=2. This is subject to the usual uncertainties of measurement and
interpretation in astronomy, but should be taken seriously because it is
indicated by quite a few lines of evidence. And it might be a guide to a more
perfect theory of galaxy formation.

13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
24
The categories of this paper are: dg-ga
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
25
The categories of this paper are: patt-sol
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph