Radio number of trees
A radio labeling of a graph G is a mapping f:V(G)→{0,1,2,…} such that |f(u)−f(v)|≥diam(G)+1−d(u,v) for every pair of distinct vertices u,v of G, where diam(G) is the diameter of G and d(u,v) the distance between u and v in G. The radio number of G is the smallest integer k such that G has a radio la...
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          | Published in | Discrete Applied Mathematics Vol. 217; pp. 110 - 122 | 
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| Main Authors | , , | 
| Format | Journal Article | 
| Language | English | 
| Published | 
        Amsterdam
          Elsevier B.V
    
        30.01.2017
     Elsevier BV  | 
| Subjects | |
| Online Access | Get full text | 
| ISSN | 0166-218X 1571-0653 1872-6771 1571-0653  | 
| DOI | 10.1016/j.dam.2016.09.019 | 
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| Abstract | A radio labeling of a graph G is a mapping f:V(G)→{0,1,2,…} such that |f(u)−f(v)|≥diam(G)+1−d(u,v) for every pair of distinct vertices u,v of G, where diam(G) is the diameter of G and d(u,v) the distance between u and v in G. The radio number of G is the smallest integer k such that G has a radio labeling f with max{f(v):v∈V(G)}=k. We give a necessary and sufficient condition for a lower bound on the radio number of trees to be achieved, two other sufficient conditions for the same bound to be achieved by a tree, and an upper bound on the radio number of trees. Using these, we determine the radio number for three families of trees. | 
    
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| AbstractList | A radio labeling of a graph G is a mapping f : V(G) → {0, 1, 2, ...} such that | f(u) - f(v)| ≥ diam(G) + 1 - d(u,v) for every pair of distinct vertices u,v of G, where diam(G) is the diameter of G and d(u,v) the distance between u and v in G. The radio number of G is the smallest integer k such that G has a radio labeling f with max{ f(v) : v ∈ V(G)} = k. We give a necessary and sufficient condition for a lower bound on the radio number of trees to be achieved, two other sufficient conditions for the same bound to be achieved by a tree, and an upper bound on the radio number of trees. Using these, we determine the radio number for three families of trees. A radio labeling of a graph G is a mapping f:V(G)→{0,1,2,…} such that |f(u)−f(v)|≥diam(G)+1−d(u,v) for every pair of distinct vertices u,v of G, where diam(G) is the diameter of G and d(u,v) the distance between u and v in G. The radio number of G is the smallest integer k such that G has a radio labeling f with max{f(v):v∈V(G)}=k. We give a necessary and sufficient condition for a lower bound on the radio number of trees to be achieved, two other sufficient conditions for the same bound to be achieved by a tree, and an upper bound on the radio number of trees. Using these, we determine the radio number for three families of trees.  | 
    
| Author | Bantva, Devsi Vaidya, Samir Zhou, Sanming  | 
    
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| References | Chartrand, Erwin, Zhang (br000035) 2005; 43 Li, Mak, Zhou (br000065) 2010; 158 West (br000105) 2001 Liu, Xie (br000080) 2009; 90 Liu (br000070) 2008; 308 Kola, Panigrahi (br000060) 2015; 48 Vaidya, Bantva (br000095) 2013; 2 Čada, Ekstein, Holub, Togni (br000020) 2013; 161 Liu, Xie (br000075) 2004; 169 Griggs, Yeh (br000045) 1992; 5 Calamoneri (br000025) 2011; 54 Chartrand, Erwin, Harary, Zhang (br000030) 2001; 33 Vaidya, Bantva (br000100) 2013; 82 Liu, Zhu (br000085) 2005; 19 Benson, Porter, Tomova (br000010) 2013; 68 Vaidya, Bantva (br000090) 2013; 2013 Bantva, Vaidya, Zhou (br000005) 2015; 48 Bhatti, Nisar, Kanwal (br000015) 2011; 3 Halász, Tuza (br000050) 2015; 338 Zhang (br000115) 2002; 65 Chartrand, Zhang (br000040) 2007; 2 King, Li, Zhou (br000055) 2014; 178 Yeh (br000110) 2006; 306 Liu (10.1016/j.dam.2016.09.019_br000075) 2004; 169 Vaidya (10.1016/j.dam.2016.09.019_br000100) 2013; 82 Bhatti (10.1016/j.dam.2016.09.019_br000015) 2011; 3 Chartrand (10.1016/j.dam.2016.09.019_br000035) 2005; 43 Bantva (10.1016/j.dam.2016.09.019_br000005) 2015; 48 Benson (10.1016/j.dam.2016.09.019_br000010) 2013; 68 Kola (10.1016/j.dam.2016.09.019_br000060) 2015; 48 Li (10.1016/j.dam.2016.09.019_br000065) 2010; 158 Zhang (10.1016/j.dam.2016.09.019_br000115) 2002; 65 Chartrand (10.1016/j.dam.2016.09.019_br000040) 2007; 2 Vaidya (10.1016/j.dam.2016.09.019_br000090) 2013; 2013 Halász (10.1016/j.dam.2016.09.019_br000050) 2015; 338 Liu (10.1016/j.dam.2016.09.019_br000080) 2009; 90 Čada (10.1016/j.dam.2016.09.019_br000020) 2013; 161 Liu (10.1016/j.dam.2016.09.019_br000070) 2008; 308 Vaidya (10.1016/j.dam.2016.09.019_br000095) 2013; 2 Griggs (10.1016/j.dam.2016.09.019_br000045) 1992; 5 Yeh (10.1016/j.dam.2016.09.019_br000110) 2006; 306 West (10.1016/j.dam.2016.09.019_br000105) 2001 King (10.1016/j.dam.2016.09.019_br000055) 2014; 178 Chartrand (10.1016/j.dam.2016.09.019_br000030) 2001; 33 Liu (10.1016/j.dam.2016.09.019_br000085) 2005; 19 Calamoneri (10.1016/j.dam.2016.09.019_br000025) 2011; 54  | 
    
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| Snippet | A radio labeling of a graph G is a mapping f:V(G)→{0,1,2,…} such that |f(u)−f(v)|≥diam(G)+1−d(u,v) for every pair of distinct vertices u,v of G, where diam(G)... A radio labeling of a graph G is a mapping f : V(G) → {0, 1, 2, ...} such that | f(u) - f(v)| ≥ diam(G) + 1 - d(u,v) for every pair of distinct vertices u,v of...  | 
    
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| SubjectTerms | Channel assignment Integer programming Labeling Marking Radio Radio labeling Radio number Radio programming Studies Trees  | 
    
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| Title | Radio number of trees | 
    
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