Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the impossibility of four-dimensional complex-hyperbolic Einstein
  Dehn filling   We show that the complex-hyperbolic Einstein Dehn filling compactification
cannot possibly be performed in dimension four.

36
The categories of this paper are: cmp-lg
6
The categories of this paper are: astro-ph
8
The categories of this paper are: hep-ex
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph