Zikai Tang

activity

20122024

most citedOn a Conjecture of Randić Index and Graph Radius

2 citations · 5 across the 7 of their papers we have counts for

collaborators

Showing 2022Show all

2 papers · 1 filter

math.CO2022

Molecular trees with extremal values of the second Sombor index

Zikai Tang, Hanyuan Deng

A new geometric background of graph invariants was introduced by Gutman, of which the simplest is the second Sombor index $S O_{2}$ , defined as $SO_2=SO_2(G)=\sum_{uv\in E}\frac{|d^2_…

math.GM2022

Maximum zeroth-order general Randić index of orientations of cacti

Jiaxiang Yang, Hanyuan Deng, Zikai Tang +1

The zeroth-order general Randić index $R_{a + 1}^{0}$ of an $n$ -vertices oriented graph $D$ is equal to the sum of $(d_{u_{i}}^{+})^{a} + (d_{u_{j}}^{-})^{a}$ over all arcs $u_{i} u_{j}$ of $D$ …