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math.CO2017★ 2 cited
Rigidity for the Hopf algebra of quasi-symmetric functions
Wanwan Jia, Zhengpan Wang, Houyi Yu
We investigate the rigidity for the Hopf algebra of quasisymmetric functions with respect to the monomial, the fundamental and the quasisymmetric Schur basis, respecti…
math.CO2017★ 26 cited
Weak composition quasi-symmetric functions, Rota-Baxter algebras and Hopf algebras
Li Guo, Jean-Yves Thibon, Houyi Yu
We introduce the Hopf algebra of quasi-symmetric functions with semigroup exponents generalizing the Hopf algebra QSym of quasi-symmetric functions. As a special case we obtain the…