Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Galaxy Collisions and Star Formation   We present a brief overview of some recent observations of colliding galaxies
and relevant numerical simulations. These are compared, and details of the
locations and history of collision induced star formation are explored, with
possible application to star formation at earlier epochs.

2
The categories of this paper are: math
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
3
The categories of this paper are: physics
4
The categories of this paper are: cond-mat
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org