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math.CO2008★ 31 cited
Asymptotic energy of graphs
Weigen Yan, Zuhe Zhang
The energy of a simple graph arising in chemical physics, denoted by , is defined as the sum of the absolute values of eigenvalues of . We consider the asympt…
math.CO2008
The enumeration of independent sets on some lattices
Zuhe Zhang
In this paper, firstly we show that the entropy constants of the number of independent sets on certain plane lattices are the same as the entropy constants of the corresponding cyl…