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- W2952336943 abstract "Given a locally finite graded set A and a commutative, associative operation on A that adds degrees, we construct a commutative multiplication * on the set of noncommutative polynomials in A which we call a quasi-shuffle product; it can be viewed as a generalization of the shuffle product. The resulting commutative algebra can be given the structure of a Hopf algebra (_A_,*,Delta). In the case where A is the set of positive integers and the operation on A is addition, (_A_,*,Delta) is the Hopf algebra of quasi-symmetric functions. If rational coefficients are allowed, there is a Hopf algebra isomorphism exp from the shuffle Hopf algebra on A onto (_A_,*,Delta). We discuss the dual of (_A_,*,Delta), and define a deformation *_q of * that coincides with * when q = 1 and is isomorphic to the concatenation product when q is not a root of unity. Finally, we discuss various examples of this construction." @default.
- W2952336943 created "2019-06-27" @default.
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- W2952336943 date "1999-07-27" @default.
- W2952336943 modified "2023-09-27" @default.
- W2952336943 title "Quasi-shuffle products" @default.
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