Opuscula Math. 34, no. 3 (2014), 609-620
http://dx.doi.org/10.7494/OpMath.2014.34.3.609

 
Opuscula Mathematica

Signed star (k,k)-domatic number of a graph

S. M. Sheikholeslami
L. Volkmann

Abstract. Let \(G\) be a simple graph without isolated vertices with vertex set \(V(G)\) and edge set \(E(G)\) and let \(k\) be a positive integer. A function \(f:E(G)\longrightarrow \{-1, 1\}\) is said to be a signed star \(k\)-dominating function on \(G\) if \(\sum_{e\in E(v)}f(e)\ge k\) for every vertex \(v\) of \(G\), where \(E(v)=\{uv\in E(G)\mid u\in N(v)\}\). A set \(\{f_1,f_2,\ldots,f_d\}\) of signed star \(k\)-dominating functions on \(G\) with the property that \(\sum_{i=1}^df_i(e)\le k\) for each \(e\in E(G)\), is called a signed star \((k,k)\)-dominating family (of functions) on \(G\). The maximum number of functions in a signed star \((k,k)\)-dominating family on \(G\) is the signed star \((k,k)\)-domatic number of \(G\), denoted by \(d^{(k,k)}_{SS}(G)\). In this paper we study properties of the signed star \((k,k)\)-domatic number \(d_{SS}^{(k,k)}(G)\). In particular, we present bounds on \(d_{SS}^{(k,k)}(G)\), and we determine the signed \((k,k)\)-domatic number of some regular graphs. Some of our results extend these given by Atapour, Sheikholeslami, Ghameslou and Volkmann [Signed star domatic number of a graph, Discrete Appl. Math. 158 (2010), 213-218] for the signed star domatic number.

Keywords: signed star \((k,k)\)-domatic number, signed star domatic number, signed star \(k\)-dominating function, signed star dominating function, signed star \(k\)-domination number, signed star domination number, regular graphs.

Mathematics Subject Classification: 05C69.

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  • S. M. Sheikholeslami
  • Azarbaijan Shahid Madani University, Department of Mathematics, Research Group of Processing and Communication, Tabriz, I.R. Iran
  • L. Volkmann
  • RWTH-Aachen University, Lehrstuhl II für Mathematik, 52056 Aachen, Germany
  • Received: 2012-02-17.
  • Revised: 2013-02-28.
  • Accepted: 2014-01-23.
Opuscula Mathematica - cover

Cite this article as:
S. M. Sheikholeslami, L. Volkmann, Signed star (k,k)-domatic number of a graph, Opuscula Math. 34, no. 3 (2014), 609-620, http://dx.doi.org/10.7494/OpMath.2014.34.3.609

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