Outer independent global dominating set of trees and unicyclic graphs
| Main Authors: | Mojdeh, Doost Ali; Department of Mathematics, University of Mazandaran, Babolsar, Iran, Alishahi, Mortaza; Department of Mathematics, Islamic Azad University, Nazarabad Branch, Nazarabad, Iran, and Department of Mathematics, University of Tafresh, Tafresh, Iran. |
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| Other Authors: | Partialy by Univesity of Tafresh |
| Format: | Article info application/pdf eJournal |
| Bahasa: | eng |
| Terbitan: |
GTA Research Group, Univ. Newcastle, Indonesian Combinatorics Society and ITB
, 2019
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| Subjects: | |
| Online Access: |
https://www.ejgta.org/index.php/ejgta/article/view/171 https://www.ejgta.org/index.php/ejgta/article/view/171/pdf_100 |
Daftar Isi:
- Let G be a graph. A set D ⊆ V(G) is a global dominating set of G if D is a dominating set of G and $\overline G$. γg(G) denotes global domination number of G. A set D ⊆ V(G) is an outer independent global dominating set (OIGDS) of G if D is a global dominating set of G and V(G) − D is an independent set of G. The cardinality of the smallest OIGDS of G, denoted by γgoi(G), is called the outer independent global domination number of G. An outer independent global dominating set of cardinality γgoi(G) is called a γgoi-set of G. In this paper we characterize trees T for which γgoi(T) = γ(T) and trees T for which γgoi(T) = γg(T) and trees T for which γgoi(T) = γoi(T) and the unicyclic graphs G for which γgoi(G) = γ(G), and the unicyclic graphs G for which γgoi(G) = γg(G).