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arXiv 0903.2507math.COcs.DS
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图的Fibonacci维数

The Fibonacci dimension of a graph

Sergio Cabello, David Eppstein, Sandi Klavzar

摘要:

引入了图G的Fibonacci维数fdim(G)作为最小整数f,使得G可以等距嵌入到f维Fibonacci立方体Gamma_f中.我们给出了一个图的Fibonacci维数的等距和格维数的界限,提供了一个组合的Fibonacci维数使用的相关图的性质的表征,并建立了Fibonacci维数为某些家庭的图。从算法的角度证明了判定fdim(G)是否等于G的等距维数是NP-完全的,并且在(741/740)-ε内逼近fdim(G)也是NP-难的.我们还给出了一般情况下fdim(G)的(3/2)-逼近算法和单纯形图的(1+ n)-逼近算法。

英文摘要:

The Fibonacci dimension fdim(G) of a graph G is introduced as the smallest integer f such that G admits an isometric embedding into Gamma_f, the f-dimensional Fibonacci cube. We give bounds on the Fibonacci dimension of a graph in terms of the isometric and lattice dimension, provide a combinatorial characterization of the Fibonacci dimension using properties of an associated graph, and establish the Fibonacci dimension for certain families of graphs. From the algorithmic point of view we prove that it is NP-complete to decide if fdim(G) equals to the isometric dimension of G, and that it is also NP-hard to approximate fdim(G) within (741/740)-epsilon. We also give a (3/2)-approximation algorithm for fdim(G) in the general case and a (1+epsilon)-approximation algorithm for simplex graphs.

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