2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/148356In a previous paper we showed that bracket relations uniquely fix the tree-level bosonic string $S$-matrix for $N\leq 26$ particle scattering. In this note we extend the proof to $N$-particle scattering for all $N$.6pp, harvmac,Texable versionHigh Energy Physics - Theorytext