Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mathematical aspects of Wiener index   The Wiener index (i.e., the total distance or the transmission number),
defined as the sum of distances between all unordered pairs of vertices in a
graph, is one of the most popular molecular descriptors. In this article we
summarize some results, conjectures and problems on this molecular descriptor,
with emphasis on works we were involved in.

14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
21
The categories of this paper are: adap-org
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
29
The categories of this paper are: funct-an
7
The categories of this paper are: hep-th
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex