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《数学季刊》2016,(2):147-154
Let G be a simple graph. An IE-total coloring f of G is a coloring of the vertices and edges of G so that no two adjacent vertices receive the same color. For each vertex x of G, let C(x) be the set of colors of vertex x and edges incident to x under f. For an IE-total coloring f of G using k colors, if C(u) 6= C(v) for any two different vertices u and v of G, then f is called a k-vertex-distinguishing IE-total-coloring of G or a k-VDIET coloring of G for short. The minimum number of colors required for a VDIET coloring of G is denoted by χievt(G) and is called vertex-distinguishing IE-total chromatic number or the VDIET chromatic number of G for short. The VDIET colorings of complete bipartite graphs K8,n are discussed in this paper. Particularly, the VDIET chromatic number of K8,n are obtained. 相似文献
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Let G be a simple graph.An IE-total coloring f of G refers to a coloring of the vertices and edges of G so that no two adjacent vertices receive the same color.Let C(u) be the set of colors of vertex u and edges incident to u under f.For an IE-total coloring f of G using k colors,if C(u)=C(v) for any two different vertices u and v of V(G),then f is called a k-vertex-distinguishing IE-total-coloring of G,or a k-VDIET coloring of G for short.The minimum number of colors required for a VDIET coloring of G is denoted by χ ie vt (G),and it is called the VDIET chromatic number of G.We will give VDIET chromatic numbers for complete bipartite graph K4,n (n≥4),K n,n (5≤ n ≤ 21) in this article. 相似文献
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Let G be a simple graph.An IE-total coloring f of G refers to a coloring of the vertices and edges of G so that no two adjacent vertices receive the same color.Let C(u) be the set of colors of vertex u and edges incident to u under f.For an IE-total coloring f of G using k colors,if C(u)=C(v) for any two different vertices u and v of V(G),then f is called a k-vertex-distinguishing IE-total-coloring of G,or a k-VDIET coloring of G for short.The minimum number of colors required for a VDIET coloring of G is denoted by χ ie vt (G),and it is called the VDIET chromatic number of G.We will give VDIET chromatic numbers for complete bipartite graph K4,n (n≥4),K n,n (5≤ n ≤ 21) in this article. 相似文献
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图G的一个k-正常边染色f被称为点可区别边染色是指任何两点的点及其关联边的色集合不同,所用最小的正整数k被称为G的点可区别边色数,记为x′_(vd)(G).用K_(2n)-E(C_4)表示2n阶完全图删去其中一条4阶路的边后得到的图,文中得到了K_(2n)-E(_4)的点可区别边色数. 相似文献
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Abstract A k-edge-coloring f of a connected graph G is a (A1, A2, , A)-defected k-edge-coloring if there is a smallest integer/ with 1 _ /3 _〈 k - i such that the multiplicity of each color j E {1,2,... ,/3} appearing at a vertex is equal to Aj _〉 2, and each color of {/3 -}- 1,/3 - 2, - , k} appears at some vertices at most one time. The (A1, A2,, A/)-defected chromatic index of G, denoted as X (A1, A2,, A/; G), is the smallest number such that every (A1,A2,-.., A/)-defected t-edge-coloring of G holds t _〉 X(A1, A2 A;; G). We obtain A(G) X(A1, )2, , A/; G) + -- (Ai - 1) _〈 /k(G) 1, and introduce two new chromatic indices of G i=1 as: the vertex pan-biuniform chromatic index X pb (G), and the neighbour vertex pan-biuniform chromatic index Xnpb(G), and furthermore find the structure of a tree T having X pb (T) =1. 相似文献
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应用构造具体染色的方法给出了m阶路和n阶完全图K_n的Cartesian积图的令β点可区别I-全染色得到了图P_m囗K_n的邻点可区别I-全色数. 相似文献
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为了找到联图P_m∨C_n及C_m∨C_n的点可区别全染色利用其组合度用构造法得到了P_m∨C_n及C_m∨C_n的点可区别全染色方法并得到了其点可区别全色数(m≠n). 相似文献
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为了寻找一般图的邻点可区别I-全染色法,应用构染色函数法给出了冠图Cm·Cn和Cm·Kn的邻点可区别I-全染色,得到了其邻点可区别I-全色数,进一步验证了邻点可区别I-全染色的猜想. 相似文献
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利用穷染、递推的方法讨论了路、圈、完全图、轮和扇的邻点可区别Ⅵ-全染色.并用概率方法研究了一般图的邻点可区别E-全染色,给出了图的邻点可区别E-全色数的一个上界.即δ≥7且△≥28,则有x_(at)~e(G)≤10△,其中δ是图G的最小度,△是图G的最大度. 相似文献
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根据图的邻点可区别VE-全染色的定义和性质,用概率方法研究了图的邻点可区别VE-全染色,并给出了图的邻点可区别VE-全色数的一个上界.如果δ≥7且△≥25,则有xatue(G)≤7△,其中δ是图G的最小度,△是图G的最大度. 相似文献
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基于完全图的邻点可区别全染色,得到了任意偶阶完全图的直积图K_(2s)×K_(2t)的邻点可区别全色数χ_(at)(K_(2s)×K_(2t)=2(s+t)(t、s均为正整数). 相似文献
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王国兴 《数学的实践与认识》2014,(21)
图G的正常边染色称为是点可区别的,如果对G的任意两顶点的关联边的颜色构成的集合不同.对图G进行点可区别正常边染色所需要的最少颜色数称为图G的点可区别正常边色数,记为x_s'(G).给出了3阶空图与t阶完全图的联图的点可区别正常边色数. 相似文献
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刘秀丽 《数学的实践与认识》2014,(12)
研究了圈的广义冠图C_noC_m,C_n oF_m和C_no W_m的关联邻点可区别的全染色.根据圈的广义冠图C_noC_m,C_noF_m和C_noW_m的构造特征,利用构造函数法,构造了一个从集合V(G)∪E(G)到色集合{1,2,…,k}的函数,给出了一种染色方案,得到了它们的关联邻点可区别的全色数. 相似文献
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本文研究了圈Cm和路Pm的Mycielski图的点可区别边染色问题.利用构造法给出了M(Cm)图的点可区别边染色法,得到了它的点可区别边色数,进而从图的结构关系,有效获得了M(Pm)图的相应点可区别边染色法和其边色数.该方法对研究存在结构关系的图染色问题具有重要的借鉴意义. 相似文献
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图G的一个k-正常边染色f被称为点可区别边染色是指任何两点的点及其关联边的色集合不同,所用最小的正整数k被称为G的点可区别边色数,记为X'_(vd)(G).用k_(2n)-E(C_m)表示2n阶完全图删去其中一条m阶路的边后得到的图,得到了K_(14)-E(C_4),K_(16)-E(C_4),K_(18)-E(C_5),K_(20)-E(C_5)的点可区别边色数分别为14,16,18,20. 相似文献
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Let G be a multigraph with vertex set V(G). Assume that a positive integer f(v) with 1 ≤ f(v) ≤ d(v) is associated with each vertex v ∈ V. An edge coloring of G is called an f-edge cover-coloring, if each color appears at each vertex v at least f(v) times. Let X'fc(G) be the maximum positive integer k for which an f-edge cover-coloring with k colors of G exists. In this paper, we give a new lower bound of X'fc(G), which is sharp. 相似文献