The algorithmic complexity of the minus clique-transversal problem

Guangjun Xu; Erfang Shan; Liying Kang; Edwin Tai Chiu Cheng

doi:10.1016/j.amc.2006.12.027

The algorithmic complexity of the minus clique-transversal problem

Guangjun Xu, Erfang Shan, Liying Kang, Edwin Tai Chiu Cheng

Research output: Journal article publication › Journal article › Academic research › peer-review

9 Citations (Scopus)

Abstract

A minus clique-transversal function of a graph G = (V, E) is a function f : V → {- 1, 0, 1} such that ∑u ∈ V (C)f (u) ≥ 1 for every clique C of G. The weight of a minus clique-transversal function is f (V) = ∑ f (v), over all vertices v ∈ V. The minus clique-transversal number of a graph G, denoted τc-(G), equals the minimum weight of a minus clique-transversal function of G. The upper minus clique-transversal number of a graph G, denoted Tc-(G), equals the maximum weight of a minimal minus clique-transversal function of G. In this paper, we show that the minus clique-transversal problem (respectively, upper minus clique-transversal problem) is NP-complete even when restricted to chordal graphs. On the other hand, we give a linear algorithm to solve the minus clique-transversal problem for block graphs.

Original language	English
Pages (from-to)	1410-1418
Number of pages	9
Journal	Applied Mathematics and Computation
Volume	189
Issue number	2
DOIs	https://doi.org/10.1016/j.amc.2006.12.027
Publication status	Published - 15 Jun 2007

Keywords

Algorithm
Block graph
Clique-transversal set
Minus clique-transversal function

ASJC Scopus subject areas

Applied Mathematics
Computational Mathematics
Numerical Analysis

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10.1016/j.amc.2006.12.027

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AU - Shan, Erfang

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AU - Cheng, Edwin Tai Chiu

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N2 - A minus clique-transversal function of a graph G = (V, E) is a function f : V → {- 1, 0, 1} such that ∑u ∈ V (C)f (u) ≥ 1 for every clique C of G. The weight of a minus clique-transversal function is f (V) = ∑ f (v), over all vertices v ∈ V. The minus clique-transversal number of a graph G, denoted τc-(G), equals the minimum weight of a minus clique-transversal function of G. The upper minus clique-transversal number of a graph G, denoted Tc-(G), equals the maximum weight of a minimal minus clique-transversal function of G. In this paper, we show that the minus clique-transversal problem (respectively, upper minus clique-transversal problem) is NP-complete even when restricted to chordal graphs. On the other hand, we give a linear algorithm to solve the minus clique-transversal problem for block graphs.

AB - A minus clique-transversal function of a graph G = (V, E) is a function f : V → {- 1, 0, 1} such that ∑u ∈ V (C)f (u) ≥ 1 for every clique C of G. The weight of a minus clique-transversal function is f (V) = ∑ f (v), over all vertices v ∈ V. The minus clique-transversal number of a graph G, denoted τc-(G), equals the minimum weight of a minus clique-transversal function of G. The upper minus clique-transversal number of a graph G, denoted Tc-(G), equals the maximum weight of a minimal minus clique-transversal function of G. In this paper, we show that the minus clique-transversal problem (respectively, upper minus clique-transversal problem) is NP-complete even when restricted to chordal graphs. On the other hand, we give a linear algorithm to solve the minus clique-transversal problem for block graphs.

KW - Algorithm

KW - Block graph

KW - Clique-transversal set

KW - Minus clique-transversal function

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The algorithmic complexity of the minus clique-transversal problem

Abstract

Keywords

ASJC Scopus subject areas

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