Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Timelike surfaces with harmonic inverse mean curvature   In this paper we introduce the notion of timelike surface with harmonic
inverse mean curvature in 3-dimensional Lorentzian space forms, and study their
fundamental properties.

5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn