Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effects of Some Operations on Domination Chromatic Number in Graphs   For a simple graph $G$, a domination coloring of $G$ is a proper vertex
coloring such that every vertex of $G$ dominates at least one color class, and
every color class is dominated by at least one vertex. The domination chromatic
number, denoted by $\chi_{dd}(G)$, is minimum number of colors among all
domination colorings of $G$. In this paper, we discuss the effects of some
typical operations on $\chi_{dd}(G)$, such as vertex (edge) removal, vertex
(edge) contraction, edge subdivision, and cycle extending.

6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
23
The categories of this paper are: solv-int
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
13
The categories of this paper are: quant-ph
24
The categories of this paper are: dg-ga
7
The categories of this paper are: hep-th
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph