Bounds on the connected domination number of a graph

  • Authors:
  • Wyatt J. Desormeaux;Teresa W. Haynes;Michael A. Henning

  • Affiliations:
  • -;-;-

  • Venue:
  • Discrete Applied Mathematics
  • Year:
  • 2013

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Abstract

A subset S of vertices in a graph G=(V,E) is a connected dominating set of G if every vertex of V@?S is adjacent to a vertex in S and the subgraph induced by S is connected. The minimum cardinality of a connected dominating set of G is the connected domination number @c"c(G). The girth g(G) is the length of a shortest cycle in G. We show that if G is a connected graph that contains at least one cycle, then @c"c(G)=g(G)-2, and we characterize the graphs obtaining equality in this bound. We also establish various upper bounds on the connected domination number of a graph, as well as Nordhaus-Gaddum type results.