2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/170509Quickly convergent series are given to compute polyzeta numbers. The formula involves an intricate combination of (generalized) polylogarithms at 1/2. However, the combinatorics has a very simple geometric interpretation: it corresponds with the square map on some symmetric space P.18 pagesNumber TheoryCombinatorics11M99, 17B01, 53C35text