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math.CO2012
The asymptotic number of different rooted trees of a tree
Xueliang Li, Yiyang Li, Yongtang Shi
Let be the set of trees with vertices. Suppose that each tree in is equally likely. We show that the number of different rooted trees of a tree…
math.CO2012
The strong rainbow vertex-connection of graphs
Xueliang Li, Yaping Mao, Yongtang Shi
A vertex-colored graph is said to be rainbow vertex-connected if every two vertices of are connected by a path whose internal vertices have distinct colors, such a path is…