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On distance dominator packing coloring in graphs

Authors: Jasmina Ferme; Dasa Stesl;

On distance dominator packing coloring in graphs

Abstract

Let G be a graph and let S = (s1,s2,..., sk) be a non-decreasing sequence of positive integers. An S-packing coloring of G is a mapping c : V(G) ? {1, 2,..., k} with the following property: if c(u) = c(v) = i, then d(u,v) > si for any i ? {1, 2,...,k}. In particular, if S = (1, 2, 3, ..., k), then S-packing coloring of G is well known under the name packing coloring. Next, let r be a positive integer and u,v ? V(G). A vertex u r-distance dominates a vertex v if dG(u, v)? r. In this paper, we present a new concept of a coloring, namely distance dominator packing coloring, defined as follows. A coloring c is a distance dominator packing coloring of G if it is a packing coloring of G and for each x ? V(G) there exists i ? {1,2, 3,...} such that x i-distance dominates each vertex from the color class of color i. The smallest integer k such that there exists a distance dominator packing coloring of G using k colors, is the distance dominator packing chromatic number of G, denoted by ?d?(G). In this paper, we provide some lower and upper bounds on the distance dominator packing chromatic number, characterize graphs G with ?d?(G) ? {2,3}, and provide the exact values of ?d?(G) when G is a complete graph, a star, a wheel, a cycle or a path. In addition, we consider the relation between ?? (G) and ?d?(G) for a graph G.

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
2
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