Sur une opérade ternaire liée aux treillis de Tamari

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We introduce an anticyclic operad V given by a ternary generator and a quadratic relation. We show that it admits a natural basis indexed by planar binary trees. We then relate this construction to the familly of Tamari lattices (Yₙ) for n>=0 by defining an isomorphism between V(2n+1) and the Grothendieck group of the category mod Yₙ. This isomorphism maps the basis of V(2n+1) to the classes of projective modules and sends the anticyclic map of the operad V to the Coxeter transformation of the derived category of mod Yₙ. One can then use Koszul duality and a Legendre transform to compute the characteristic polynomial of these Coxeter transformations.