Mathematics – Combinatorics
Scientific paper
2010-11-12
Mathematics
Combinatorics
7 pages, error on Proposition 1 corrected, one figure added
Scientific paper
We define two coproducts for cycle-free oriented graphs, thus building up two
commutative con- nected graded Hopf algebras, such that one is a
comodule-coalgebra on the other, thus generalizing the result obtained
previously for Hopf algebras of rooted trees.
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