Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Doing Math in Jest: Reflections on Useless Math, the Unreasonable
  Effectiveness of Mathematics, and the Ethical Obligations of Mathematicians   Mathematicians occasionally discover interesting truths even when they are
playing with mathematical ideas with no thoughts about possible consequences of
their actions. This paper describes two specific instances of this phenomenon.
The discussion touches upon the theme of the unreasonable effectiveness of
mathematics as well as the ethical obligations of mathematicians.

27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
17
The categories of this paper are: q-fin
3
The categories of this paper are: physics
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
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The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
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The categories of this paper are: solv-int
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The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
16
The categories of this paper are: stat