2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/127349The structure of anticyclic operad on the Dendriform operad defines in particular a matrix of finite order acting on the vector space spanned by planar binary trees. We compute its characteristic polynomial and propose a (compatible) conjecture for the characteristic polynomial of the Coxeter transformation for the Tamari lattice, which is mostly a square root of this matrix.12 pagesQuantum Algebra18D50, 05E05, 06A07text