Abstract
Let Y be a subset of real numbers. A Y-dominating function of a graph G = ( V , E ) is a function f : V → Y such that ∑ u ∈ N G [ v ] f ( u ) ⩾ 1 for all vertices v ∈ V , where N G [ v ] = { v } ∪ { u | ( u , v ) ∈ E } . Let f ( S ) = ∑ u ∈ S f ( u ) for any subset S of V and let f ( V ) be the weight of f. The Y-domination problem is to find a Y-dominating function of minimum weight for a graph G = ( V , E ) . In this paper, we study the variations of Y-domination such as { k } -domination, k-tuple domination, signed domination, and minus domination for some classes of graphs. We give formulas to compute the { k } -domination, k-tuple domination, signed domination, and minus domination numbers of paths, cycles, n-fans, n-wheels, n-pans, and n-suns. Besides, we present a unified approach to these four problems on strongly chordal graphs. Notice that trees, block graphs, interval graphs, and directed path graphs are subclasses of strongly chordal graphs. This paper also gives complexity results for the problems on doubly chordal graphs, dually chordal graphs, bipartite planar graphs, chordal bipartite graphs, and planar graphs.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
