arXiv subjects

Tadeja Kraner Šumenjak

Publications and source records attributed to Tadeja Kraner Šumenjak.

2 recordsLinked to original sources

arXiv2017

On $k$-rainbow independent domination in graphs

In this paper, we define a new domination invariant on a graph $G$, which coincides with the ordinary independent domination number of the generalized prism $G \Box K_k$, called the $k$-rainbow independent domination number and denoted by $γ_{{\rm ri}k}(G)$. Some bounds and exact values concerning this domination concept are determined. As a main result, we prove a Nordhaus-Gaddum-type theorem on the sum for $2$-rainbow independent domination number, and show if G is a graph of order $n \geq 3$, then $5\leq γ_{{\rm ri}2}(G)+γ_{{\rm ri}2}(\overline{G})\leq n+3$, with both bounds being sharp.

math.CO↗

arXiv2016

Partitioning the vertex set of $G$ to make $G\,\Box\, H$ an efficient open domination graph

A graph is an efficient open domination graph if there exists a subset of vertices whose open neighborhoods partition its vertex set. We characterize those graphs $G$ for which the Cartesian product $G \Box H$ is an efficient open domination graph when $H$ is a complete graph of order at least 3 or a complete bipartite graph. The characterization is based on the existence of a certain type of weak partition of $V(G)$. For the class of trees when $H$ is complete of order at least 3, the characterization is constructive. In addition, a special type of efficient open domination graph is characterized among Cartesian products $G \Box H$ when $H$ is a 5-cycle or a 4-cycle.

math.CO↗