Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Theory and practice   The author argues to Silicon Valley that the most important and powerful part
of computer science is work that is simultaneously theoretical and practical.
He particularly considers the intersection of the theory of algorithms and
practical software development. He combines examples from the development of
the TeX typesetting system with clever jokes, criticisms, and encouragements.

16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph
28
The categories of this paper are: alg-geom
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga