Forcing Full Domination in Graphs

Robert C. Brigham1, Gary Chartrand2, Ronald D. Dutton3, Ping Zhang2
1Department of Mathematics University of Central Florida, Orlando, FL 32816
2Department of Mathematics Western Michigan University, Kalamazoo, MI 49008
3Program of Computer Science University of Central Florida, Orlando, FL 32816

Abstract

For each vertex \( v \) in a graph \( G \), let there be associated a particular type of a subgraph \( F_v \) of \( G \). In this context, the vertex \( v \) is said to dominate \( F_v \). A set \( S \) of vertices of \( G \) is called a full dominating set if every vertex of \( G \) belongs to a subgraph \( F_v \) of \( G \) for some \( v \in S \) and every edge of \( G \) belongs to a subgraph \( F_w \) of \( G \) for some \( w \in S \). The minimum cardinality of a full dominating set of \( G \) is its full domination number \( \gamma_F(G) \). A full dominating set of \( G \) of cardinality \( \gamma_F(G) \) is called a \( \gamma_F \)-set of \( G \).

We study three types of full domination in graphs: full star domination, where \( F_v \) is the maximum star centered at \( v \); full closed domination, where \( F_v \) is the subgraph induced by the closed neighborhood of \( v \); and full open domination, where \( F_v \) is the subgraph induced by the open neighborhood of \( v \).

A subset \( T \) of a \( \gamma_F \)-set \( S \) in a graph \( G \) is a forcing subset for \( S \) if \( S \) is the unique \( \gamma_F \)-set containing \( T \). The forcing full domination number of \( S \) in \( G \) is the minimum cardinality of a forcing subset for \( S \), and the forcing full domination number \( f_{\gamma_F}(G) \) of the graph \( G \) is the minimum forcing full domination number among all \( \gamma_F \)-sets of \( G \).

We present several realization results concerning forcing parameters in full domination.

Keywords: full domination, full forcing domination. AMS Subject Classification: 05C12.