Mathematica Bohemica, Vol. 142, No. 1, pp. 9-20, 2017
Changing of the domination number of a graph: edge multisubdivision and edge removal
Vladimir Samodivkin
Received February 25, 2015. First published October 18, 2016.
Abstract: For a graphical property $\mathcal{P}$ and a graph $G$, a subset $S$ of vertices of $G$ is a $\mathcal{P}$-set if the subgraph induced by $S$ has the property $\mathcal{P}$. The domination number with respect to the property $\mathcal{P}$, denoted by $\gamma_{\mathcal{P}} (G)$, is the minimum cardinality of a dominating $\mathcal{P}$-set. We define the domination multisubdivision number with respect to $\mathcal{P}$, denoted by $ msd _{\mathcal{P}}(G)$, as a minimum positive integer $k$ such that there exists an edge which must be subdivided $k$ times to change $\gamma_{\mathcal{P}} (G)$. In this paper \item{(a)} we present necessary and sufficient conditions for a change of $\gamma_{\mathcal{P}}(G)$ after subdividing an edge of $G$ once, \item{(b)} we prove that if $e$ is an edge of a graph $G$ then $\gamma_{\mathcal{P}} (G_{e,1}) < \gamma_{\mathcal{P}} (G)$ if and only if $\gamma_{\mathcal{P}} (G-e) < \gamma_{\mathcal{P}} (G)$ ($G_{e,t}$ denotes the graph obtained from $G$ by subdivision of $e$ with $t$ vertices), \item{(c)} we also prove that for every edge of a graph $G$ we have $\gamma_{\mathcal{P}}(G-e)\leq\gamma_{\mathcal{P}}(G_{e,3})\leq\gamma_{\mathcal{P}}(G-e) + 1$, and \item{(d)} we show that $ msd_{\mathcal{P}}(G) \leq3$, where $\mathcal{P}$ is hereditary and closed under union with $K_1$.
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Affiliations: Vladimir Samodivkin, Departement of Mathematics, Faculty of Transportation Engineering, Civil Engineering and Geodesy, University of Architecture, 1 Hristo Smirnenski Blvd., 1046 Sofia, Bulgaria, e-mail: vl.samodivkin@gmail.com
