Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Five ideas on black hole accretion disks   I review five of Bohdan Paczynski's ideas on black hole accretion disk
theory. They formed my understanding of the subject and often guided intuition
in my research. They are fundamentally profound, rich in physical consequences,
mathematically elegant and clever, and in addition are useful in several
technically difficult practical applications.

13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
26
The categories of this paper are: bayes-an
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics