Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On augmented eccentric connectivity index of graphs and trees   In this paper we establish all extremal graphs with respect to augmented
eccentric connectivity index among all (simple connected) graphs, among trees
and among trees with perfect matching. For graphs that turn out to be extremal
explicit formulas for the value of augmented eccentric connectivity index are
derived.

15
The categories of this paper are: nucl-ex
7
The categories of this paper are: hep-th
14
The categories of this paper are: math-ph
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
29
The categories of this paper are: funct-an
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg