#### Title

Semipaired Domination in Graphs

#### Document Type

Article

#### Publication Date

2-1-2018

#### Description

In honor of Professor Peter Slater's work on paired domination, we introduce a relaxed version of paired domination, namely semipaired domination. Let G be a graph with vertex set V and no isolated vertices. A subset S ⊆ V is a semipaired dominating set of G if every vertex in V \ S is adjacent to a vertex in S and S can be partitioned into two element subsets such that the vertices in each subset are at most distance two apart. The semipaired domination number γPr2(G) is the minimum cardinality of a semipaired dominating set of G. In this paper, we study the semipaired domination versus other domination parameters. For example, we show that γ(G) ≤ γPr2(G) ≤ 2γ(G) and 2/3γt(G) ≤ γPr2(T) ≤ γ 4/3γt(G), where γ(G) and γt(G) denote the domination and total domination numbers of G. We characterize the trees G for which γPr2(G) = 2γ(G).

#### Citation Information

Haynes, Teresa W.;
and
Henning, Michael A..
2018.
Semipaired Domination in Graphs.
*Journal of Combinatorial Mathematics and Combinatorial Computing*.
Vol.104
93-109.
ISSN: 0835-3026