Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New Proof of the Generalized Second Law   The generalized second law of black hole thermodynamics was proved by Frolov
and Page for a quasi-stationary eternal black hole. However, realistic black
holes arise from a gravitational collapse, and in this case their proof does
not hold. In this paper we prove the generalized second law for a
quasi-stationary black hole which arises from a gravitational collapse.

12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
9
The categories of this paper are: nlin
0
The categories of this paper are: hep-ph
19
The categories of this paper are: eess
32
The categories of this paper are: atom-ph
30
The categories of this paper are: q-alg
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph