Le module dendriforme sur le groupe cyclique (Q999683)

Dendriform operads are known as being in fact anticyclic operads. In particular, this gives rise to an action of the cyclic group on the vector space spanned by planar binary trees. The author computes the characteristic polynomial of the generator of this cyclic action and proposes a compatible conjecture for the characteristic polynomial of the Coxeter transformation for the Tamari lattice.