2 papers
math.CO2019
Integer Linear Programming Formulations for Double Roman Domination Problem
Qingqiong Cai, Neng Fan, Yongtang Shi +1
For a graph , a double Roman dominating function (DRDF) is a function having the property that if , then vertex must have at least…
math.CO2018
k-Ary spanning trees contained in tournaments
Jiangdong Ai, Hui Lei, Yongtang Shi +2
A rooted tree is called a -ary tree, if all non-leaf vertices have exactly children, except possibly one non-leaf vertex has at most children. Denote by the min…