Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Graovac-Pisanski Index of Zig-Zag Tubulenes and the Generalized Cut
  Method   The Graovac-Pisanski index, which is also called the modified Wiener index,
was introduced in 1991 by A. Graovac and T. Pisanski. This variation of the
classical Wiener index takes into account the symmetries of a graph. In 2016 M.
Ghorbani and S. Klav\v{z}ar calculated this index by using the cut method,
which we generalize in this paper. Moreover, we prove that in some cases the
automorphism group of a zig-zag tubulene is isomorphic to the direct product of
a dihedral group and a cyclic group. Finally, the closed formulas for the
Graovac-Pisanski index of zig-zag tubulenes are calculated.

32
The categories of this paper are: atom-ph
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
20
The categories of this paper are: acc-phys
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
25
The categories of this paper are: patt-sol
13
The categories of this paper are: quant-ph
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg