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F-WORM colorings: Results for 2-connected graphs

机译:F-WORM染色:2连接图的结果

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Given two graphs F and G, an F-WORM coloring of G is an assignment of colors to its vertices in such a way that no F-subgraph of G is monochromatic or rainbow. If G has at least one such coloring, then it is called F-WORM colorable and W-(G, F) denotes the minimum possible number of colors. Here, we consider F-WORM colorings with a fixed 2-connected graph F and prove the following three main results: (1) For every natural number k, there exists a graph G which is F-WORM colorable and W-(G, F) = k; (2) It is NP-complete to decide whether a graph is F-WORM colorable; (3) For each k >= vertical bar V(F)vertical bar -1, it is NP-complete to decide whether a graph G satisfies W-(G, F) <= k. This remains valid on the class of F-WORM colorable graphs of bounded maximum degree. We also prove that for each n >= 3, there exists a graph G and integers r and s such that s >= r + 2, G has K-n-WORM colorings with exactly r and also with s colors, but it admits no K-n-WORM colorings with exactly r + 1, . . . , s - 1 colors. Moreover, the difference s - r can be arbitrarily large. (C) 2017 Elsevier B.V. All rights reserved.
机译:给定两个曲线图F和G,G的F-Vorm着色是以这种方式分配颜色,使得G的F形状或彩虹的F形状或彩虹。如果G具有至少一个这样的着色,则它被称为F-蠕虫可色,并且W-(G,F)表示最小可能的颜色数。在这里,我们考虑具有固定的2连接图F的F-WORM着色,并证明以下三个主要结果:(1)对于每个天然数K,存在图G是F-蠕虫可调和W-(G, f)= k; (2)确定图形是否为F-WORM可色; (3)对于每个k> =垂直条V(f)垂直条-1,它是np-chequess以确定图G是否满足W-(g,f)<= k。这对界最大程度的F-Vorm可色图类仍然有效。我们还证明,对于每个n> = 3,存在图G和整数R,S> = R + 2,G具有kn-蠕虫着色,恰好R,也具有S的颜色,但它承认没有kN - 污迹着色,恰好R + 1,。 。 。 ,s - 1种颜色。此外,差异S-R可以任意大。 (c)2017 Elsevier B.v.保留所有权利。

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