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On distances in vertex-weighted trees

Author

Listed:
  • Cai, Qingqiong
  • Cao, Fuyuan
  • Li, Tao
  • Wang, Hua

Abstract

The study of extremal problems on various graph invariants has received great attention in recent years. Among the most well known graph invariants is the sum of distances between all pairs of vertices in a graph. This is also known as the Wiener index for its applications in Chemical Graph Theory. Many interesting properties related to this concept have been established for extremal trees that maximize or minimize it. Recently a vertex-weighted analogue of sum of distances is introduced for vertex weighted trees. Some extremal results on (vertex-weighted) trees were obtained, by Goubko, for trees with a given degree sequence. In this note we first analyze the behavior of vertex-weighted distance sum in general, identifying the “middle part” of a tree analogous to that with respect to the regular distance sum. We then provide a simpler approach (than that of Goubko’s) to obtain a stronger result regarding the extremal tree with a given degree sequence. Questions and directions for potential future study are also discussed.

Suggested Citation

  • Cai, Qingqiong & Cao, Fuyuan & Li, Tao & Wang, Hua, 2018. "On distances in vertex-weighted trees," Applied Mathematics and Computation, Elsevier, vol. 333(C), pages 435-442.
    • Handle: RePEc:eee:apmaco:v:333:y:2018:i:c:p:435-442
    DOI: 10.1016/j.amc.2018.03.117
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    References listed on IDEAS

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    1. Goubko, Mikhail, 2018. "Maximizing Wiener index for trees with given vertex weight and degree sequences," Applied Mathematics and Computation, Elsevier, vol. 316(C), pages 102-114.
    2. Lei, Hui & Li, Tao & Ma, Yuede & Wang, Hua, 2018. "Analyzing lattice networks through substructures," Applied Mathematics and Computation, Elsevier, vol. 329(C), pages 297-314.
    3. Lan, Yongxin & Li, Tao & Ma, Yuede & Shi, Yongtang & Wang, Hua, 2018. "Vertex-based and edge-based centroids of graphs," Applied Mathematics and Computation, Elsevier, vol. 331(C), pages 445-456.
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    Cited by:

    1. Dobrynin, Andrey A., 2019. "Infinite family of 2-connected transmission irregular graphs," Applied Mathematics and Computation, Elsevier, vol. 340(C), pages 1-4.
    2. Li, Shuchao & Wang, Hua & Wang, Shujing, 2019. "Some extremal ratios of the distance and subtree problems in binary trees," Applied Mathematics and Computation, Elsevier, vol. 361(C), pages 232-245.
    3. Lan, Yongxin & Li, Tao & Wang, Hua & Xia, Chengyi, 2019. "A note on extremal trees with degree conditions," Applied Mathematics and Computation, Elsevier, vol. 341(C), pages 70-79.
    4. Tratnik, Niko, 2018. "On the Steiner hyper-Wiener index of a graph," Applied Mathematics and Computation, Elsevier, vol. 337(C), pages 360-371.

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