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math.CO2016
The distance spectra of the derangement graphs
Yunnan Li, Huiqiu Lin
In this paper, we consider the distance spectra of the derangement graphs. First we give a constructive proof that the connected derangement graphs are of diameter 2. Then we obtai…
math.CO2016
Towards a polynomial basis of the algebra of peak quasisymmetric functions
Yunnan Li
Hazewinkel proved the Ditters conjecture that the algebra of quasisymmetric functions over the integers is free commutative by constructing a nice polynomial basis. In this paper w…