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Offensive r-alliances in graphs

机译:图形中的冒犯性联盟

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Let G = (V, E) be a simple graph. For a nonempty set X subset of V, and a vertex v is an element of V, delta(X) (v) denotes the number of neighbors v has in X.Anonemptyset S subset of V is an offensive r-alliance in G if delta(S)(v) >= delta(S)- (v) + r, for all v is an element of partial derivative(S), where partial derivative(S) denotes the boundary of S. An offensive r-alliance S is called global if it forms a dominating set. The global offensive r-alliance number of G, denoted by Y-r(0)(G), is the minimum cardinality of a global offensive r-alliance in G. We show that the problem of finding optimal (global) offensive r-alliances is NP-complete and we obtain several tight bounds on Y-r(0)(G). (c) 2008 Elsevier B.V. All rights reserved.
机译:令G =(V,E)为简单图形。对于V的非空集X子集,并且顶点v是V的元素,delta(X)(v)表示v在X中具有的邻居数.V的非空集S子集是G中的进攻性r-联盟delta(S)(v)> = delta(S)-(v)+ r,因为所有v都是偏导数(S)的元素,其中偏导数(S)表示S的边界。令人讨厌的r-联盟如果S形成主导集,则称为S。 G的全局进攻性r-联盟数由Yr(0)(G)表示,是G中全局进攻性r-联盟的最小基数。我们证明了寻找最优(全局)进攻性r-联盟的问题是NP完全,我们在Yr(0)(G)上获得了几个紧边界。 (c)2008 Elsevier B.V.保留所有权利。

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