Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Initial conditions for reaching the critical velocity   The aim of this paper is to determine the initial rotational velocities
required on the ZAMS for single stars to reach the critical velocity, sometimes
called the break-up velocity, during the Main-Sequence (MS) phase. Some useful
relations between $\Omega/\Omega_{\rm crit}$, $\upsilon/\upsilon_{\rm crit}$
($\upsilon$ is the velocity at the equator), the moments of inertia, the
angular momenta, the kinetic energy in the rotation and various other basic
physical quantities are obtained.

8
The categories of this paper are: hep-ex
13
The categories of this paper are: quant-ph
2
The categories of this paper are: math
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
18
The categories of this paper are: econ
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an