Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On genera of Lefschetz fibrations and finitely presented groups   It is known that every finitely presented group is the fundamental group of
the total space of a Lefschetz fibration. In this paper, we give another proof
which improves the result of Korkmaz. In addition, Korkmaz defined the genus of
a finitely presented group. We also evaluate upper bounds for genera of some
finitely presented groups.

6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
5
The categories of this paper are: gr-qc
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The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th