19 citations · 30 across the 7 of their papers we have counts for
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math.CO2012★ 5 cited
On Wiener polarity index of cactus graphs
Nan Chen, Wen-Xue Du, Yi-Zheng Fan
The Wiener polarity index of a graph G is the number of unordered pairs of vertices u, v such that the distance between u and v is 3. In this paper we give an explicit formula for…
math.CO2012★ 19 cited
The Nullity of Bicyclic Signed Graphs
Yi-Zheng Fan, Wen-Xue Du, Chun-Long Dong
Let Γbe a signed graph and let A(Γ) be the adjacency matrix of Γ. The nullity of Γis the multiplicity of eigenvalue zero in the spectrum of A(Γ). In this paper we characterize the…