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Paired Domination Problems of Infinite Diamond Lattice

Bader Ali1, Abdullah Al Mutairi1, Paul Manuel1
1Bader Ali, Abdullah Al Mutairi, and Paul Manuel Department of Information Science, College of Computing Science and Engineering, Kuwait University, Kuwait

Abstract

A set \( S \) of vertices of a graph \( G(V,E) \) is a \emph{dominating set} if every vertex of \( V \setminus S \) is adjacent to some vertex in \( S \). A dominating set is said to be \emph{efficient} if every vertex of \( V \setminus S \) is dominated by exactly one vertex of \( S \). A paired-dominating set is a dominating set whose induced subgraph contains at least one perfect matching. A set \( S \) of vertices in \( G \) is a total dominating set of \( G \) if every vertex of \( V \) is adjacent to some vertex in \( S \). In this paper, we construct a minimum paired dominating set and a minimum total dominating set for the infinite diamond lattice. The total domatic number of \( G \) is the size of a maximum cardinality partition of \( V \) into total dominating sets. We also demonstrate that the total domatic number of the infinite diamond lattice is 4.