Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The 1965 Penrose singularity theorem   We review the first modern singularity theorem, published by Penrose in 1965.
This is the first genuine post-Einstenian result in General Relativity, where
the fundamental and fruitful concept of closed trapped surface was introduced.
We include historical remarks, an appraisal of the theorem's impact, and
relevant current and future work that belongs to its legacy.

29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
18
The categories of this paper are: econ
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat