We classify the trees on n vertices with the maximum and the minimum number of certain generalized colorings, including conflict-free, odd, non-monochromatic, star, and star rainbow vertex colorings. We also extend a result of Cutler and Radcliffe on the maximum and minimum number of existence homomorphisms from a tree to a completely looped graph on q vertices. (C) 2018 Elsevier B.V. All rights reserved.
机构:
Imam Khomeini Int Univ, Dept Math, POB 34149-16818, Qazvin, Iran
Inst Res Fundamental Sci IPM, Sch Math, Tehran, IranImam Khomeini Int Univ, Dept Math, POB 34149-16818, Qazvin, Iran
Behtoei, Ali
Anbarloei, Mahdi
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Imam Khomeini Int Univ, Dept Math, POB 34149-16818, Qazvin, IranImam Khomeini Int Univ, Dept Math, POB 34149-16818, Qazvin, Iran
机构:
Nanjing Univ, Dept Math, Nanjing 210093, Jiangsu, Peoples R China
Jiangsu Normal Univ, Sch Math & Stat, Xuzhou 221009, Jiangsu, Peoples R ChinaNanjing Univ, Dept Math, Nanjing 210093, Jiangsu, Peoples R China
Wang, Longqin
Chen, Yaojun
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Nanjing Univ, Dept Math, Nanjing 210093, Jiangsu, Peoples R ChinaNanjing Univ, Dept Math, Nanjing 210093, Jiangsu, Peoples R China