The # product in combinatorial Hopf algebras
classification
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keywords
algebrascombinatorialhopfproductalgebraarxivassociativeaval
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We show that the # product of binary trees introduced by Aval and Viennot [arXiv:0912.0798] is in fact defined at the level of the free associative algebra, and can be extended to most of the classical combinatorial Hopf algebras.
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