On the Roman domination number of the subdivision of some graphs

Document Type : Full Length Article

Authors

Imam Khomeini International University

Abstract

A Roman dominating function on a graph G = (V, E) is a function
f : V(G) → {0, 1, 2} satisfying the condition that every vertex u for which f(u) = 0 is adjacent to at least one vertex v for which f(v) = 2. The weight of a Roman dominating function is the value f(V) = ∑u∈V(G)f(u).
The minimum possible weight of a Roman dominating function on G is called the Roman domination number of G and is denoted by γR(G). In this paper, and among some other results, we provide some bounds for the Roman domination number of the subdivision graph S(G) of an arbitrary graph G.
Also, we determine the exact value of γR(S(G)) when G is Kn, Kr,s or Kn1,n2,...,nk
.

Graphical Abstract

On the Roman domination number of the subdivision of some graphs

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References

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Journal of Discrete Mathematics and Its Applications
Volume 9, Issue 4
December 2024
Pages 321-333

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History

  • Receive Date: 26 October 2024
  • Revise Date: 20 November 2024
  • Accept Date: 01 December 2024
  • First Publish Date: 01 December 2024
  • Publish Date: 01 December 2024

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