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math.CO2004
Word Hopf algebras
Michiel Hazewinkel
Two important generalizations of the Hopf algebra of symmetric functions are the Hopf algebra of noncommutative symmetric functions and its graded dual the Hopf algebra of quasisym…
math.CO2004★ 2 cited
Explicit polynomial generators for the ring of quasi-symmetric functions over the integers
Michiel Hazewinkel
In [5, 6] it has been proved that the ring of quasisymmetric functions over the integers is free polynomial, see also [4]. This is a matter that has been of great interest since 19…