2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/56687This paper is withdrawn due to unclearness of some notions on which the material is based.WithdrawnMathematical PhysicsHigh Energy Physics - TheoryQuantum AlgebraA relation between the Knizhnik--Zamolodchikov and Belavin--Polyakov--Zamolodchikov systems of partial differential equationstext