2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/64354We will prove the freeness of multi-Coxeter arrangements by constructing a basis of the module of vector fields which contact to each reflecting hyperplanes with some multiplicities using K. Saito's theory of primitive derivation.7 pagesCombinatoricsAlgebraic GeometryRepresentation Theory32S22: 05E15: 20F55The primitive derivation and freeness of multi-Coxeter arrangementstext